Nothing affecting your tiefling ... oh wait there was last time the change to Infernal Wrath but your sheet already includes that.
The errata increases the damage monsters do to fall in lines with MM3 levels. MM1 & MM2 monsters did too little damage to really threaten PC's so DM's (like myself) had to run at least n+2 encoutners or higher to even put any dent in the party's resources.
I'm still struggling to wrap my head around it, but I believe in a week or so they should update the Monster Builder with the new damage amounts. Kingmaker shall be far more interesting now
It does mean I'll need to tweak the encounters a bit to reflect the higher damage.
The errata caught a lot of abusive powers that were used by the character optimization board to create infinite damage loops or 1,000 damage per round stuff. There's only a few things that will affect most people. limiting free action attacks to 1/round.
Here's a quick breakdown. An interesting one is the Magic Missile change to make it more old-skool
Magic Missile is now auto-hit, but no damage roll...
Lead the Attack (Warlord 1) got hit, no longer lasting all encounter
Subtle weapons now must be wielded (like staff of ruin)
Free Action attacks are limited to 1/turn
Wizards Escape (lvl 6 wizard) is a daily now
Spinning Leopard Maneuver got its damage lowered
Harmonious Thunder got its wording corrected to not be auto-kill