(NEW): Vanguard: A new tree is now available for Fighters and Paladins! (NOTE: The numbers are not yet finalized, and are subject to change.) The enhancement tree is as follows:
        Innate (Core) Abilities
            1 AP: To the Fore: While you have a shield equipped, gain +1 to hit and damage with your main hand weapon and with your shield bash attacks.
            5 AP, Class Level 3: Shield Combat I:
                +10% chance to make a secondary shield bash.

            10 AP, Class Level 6: Vicious Shield:
                +10% chance to make a secondary shield bash.
                While you have a shield equipped, +5% Combat Style bonus to Melee Attack Speed.

            20 AP, Class Level 12: Shield Combat II:
                +10% chance to make a secondary shield bash.
                While you have a shield equipped, +5% Combat Style bonus to Melee Attack Speed.
                Your shield gains +1(W).

            30 AP, Class Level 18: Vicious Shield II:
                Your shield gains +1 critical threat range, +1 critical multiplier, and +1(W).
                While you have a shield equipped, +5% Combat Style bonus to Melee Attack Speed.

            40 AP, Class Level 20: Shield Champion:
                While you have a shield equipped, gain +2 attack, +2 damage, +5% Doublestrike, +5% Combat Style bonus to Melee Attack Speed.
                Your shield gains +1(W).
                Your shield bashes stun enemies 5% of the time. DC(10 + 1/2 Character Level + Strength Mod + Stunning Bonuses).

        Tier One (0 AP Required)
            Shield Specialization: While you have a shield equipped, gain +1 to hit, damage, and armor class. Passive
            No Weakness: +1/+2/+3 Fortitude Saving Throw. Passive
            Missile Shield: While you have a shield equipped, gain the benefits of the Deflect Arrows feat, knocking aside one incoming projectile that would have struck you every 6/4/2 seconds. (Antireq Tempest or Swashbuckler Deflect Arrows) Passive
            Shield Smash: While you have a shield equipped, Activate: Melee attack with your shield for +1/2/3(W) damage. On damage, your PRR and MRR are increased by 2/4/6 for 12 seconds. Cooldown is 16/12/8 seconds.
            Armor Training: +1/2/3 to Balance, Intimidate, Jump. Reduce skills penalties for armor and shield by 1/2/3. Passive

        Tier Two (5 AP Required)
            Shield Specialization: While you have a shield equipped, gain +1 to hit, damage, and armor class.
            Brutality: +1/+2/+3 to the DC of stunning abilities.
            Stunning Shield: While you have a shield equipped, Activate: Melee shield bash attack with your shield for +1/2/3[W] attack. This attack stuns enemies unless they make a Fortitude saving throw vs DC(10 + Highest Ability Score Modifier + Character Level + Stunning Bonus). Cooldown 60/45/30 seconds. Stun duration 6 seconds.
            Action Boost: Melee Power: +10/20/30% Action Boost bonus to Melee Power for 20 seconds. Usable 5 times per rest.
            Unbalancing Shove: When you shield bash, damaged enemies get -1 to Saving Throws for 2/4/6 seconds.

        Tier Three
            Shield Specialization: While you have a shield equipped, gain +1 to hit, damage, and armor class.
            Follow Up: When you hit an enemy with certain activated stunning abilities (Stunning Blow, Stunning Shield) your melee power is increased by 3/6/9 for 12 seconds whether the stun works or not.
            Fatal Bulwark: Your shield gains +1 critical threat range.
            Shield Riposte: When missed in melee while wearing a shield: Deals 1d4/1d6/1d8 bludgeoning damage to your attacker. Scales with melee power.
            STR/DEX

        Tier Four
            Shield Specialization: While you have a shield equipped, gain +1 to hit, damage, and armor class.
            (NOTE: Shield Charge is not currently working on Lamannia): Shield Charge: While you have a shield equipped, Activate: Rush forward up to 30 feet to your selected opponent and deliver a shield attack that hits everything in a around you. Each opponent is knocked down and takes a shield bash attack for +1/2/3[W] damage. The saving throw for the knockdown attack is 20 + Highest Attribute Mod + Class Level + bonuses to trip attacks. Ranks improve cooldown
            Myrmidon’s Edge: Passive +1/2/3 to attack rolls to confirm critical hits and damage on critical hits (before weapon multipliers) .
            STR/DEX

        Tier Five
            Shield Rush: While you have a shield equipped, Activate: Move forward in a line, delivering a shield bash attack to every creature hit. This shield bash does +2/4/6[W] damage. Rank improves cooldown
            Disorienting Smash: When you shield bash, damaged enemies gain 1 stack of Vulnerability. This can occur at most once every 3/2/1 seconds.
            Vulnerability: You take 1% more damage for 3 seconds. This effect stacks up to 20 times, and loses one stack on expiration.
            Shield To The Face: +10% chance to make a secondary shield bash.
            Armored Strength: +10 Melee Power

20% shield
20% feat
10% core
10% tier 5
15% StD

Nothing else that i can think of currently

If that's still true then I'd say more than 20% shield bash chance are useless? I mean... you should be able to make more than one attack  each second...
Or do I miss something about shield bashes? o.O

Correct, however you still can only shield bash while attacking once every 6 seconds, due to how the stupid thing is coded..

Vulnerability: You take 1% more damage for 3 seconds. This effect stacks up to 20 times, and loses one stack on expiration.

Vulnerability isn't a T5, the power above it is and gives a Vulnerability stack.  I think the formatting should show that Vulnerability is an effect and this just describes the effect.

Correct, however you still can only shield bash while attacking once every 6 seconds, due to how the stupid thing is coded..