A successfull KD don't give damage. No more discipline skill, so the popular clr/ftr/rog builds can go now without taking ftr lvls easier(an give more space to clr lvls or prestige classes)
Warlocks

damn, they are good for pvp
Bard song way changed and only 1 inspiration at a time active
Clerics: Domains:
destruct: looks nice to rage a cleric
fire: tried out on katrina II tryout, and since the max lvl is 20, fireballs are a nice add to her. Fire resist 5 is nice to have aswell.
Trickery: without improved invisibility (aka greater invisibility).
War: battlemaster 1/day, sounds nice, need to try out
other domains are pretty similar to nwn1
Druids: i've been heared they can cast in wildshape atm. Not tried out yet
Rangers get hips as noted above, thou only outside places.
Haven't tried a prestige class yet but for those who haven't decided to buy the game or not; here's a small taste of them:
Arcane archer, Arcane Trickster, Assassin, Blackguard, divine champion, duellist, dwarven defender, eldritch knight, frenzied beserker, harper agent, pale master, Red dragon disciple, shadow thief of amn (only accessable in solo campain?), shadowdancer,warpriest and weapon master. A whole bunch to try out.
Lotta new spells went in and a few are away or replaced.
Ultravision, is now blind sight (3th lvl)
improved invisiblilty became greater invisiblilty
Haste = mass haste, only need to stand very close on each other to make it work
improved mage armor is new and good
stonehold and hammer of the gods seems to powered down
lowlight vision spell
false life is nice for a wizzy/sorc to have
These aren't all new or changed ones, but only those i have seen for now.
Buffs last way less longer now aswell, 1min/lvl tops,lotta only 6secs/lvl, so the extend feat becomes more than usefull.
Feats i tried and approved so far:
Mind over body (int instead of con for hps)
spellcasting prodigy ( all spells counts as if you have +2 on the int/wis or cha score, aswell bonus spells)
monkey grip (use 2handed weap in 1 hand)
power critical (gains a +4 on determination for a crit hit)
many shot ( sure gonna be a favorite feat for the archers; fire multiple arrows)
practiced spellcaster( raises ''casterlevel'')
more things to come when i completed the solo game