just its said here, since i havent really seen it anywhere else, all of the new sounds for skills and attacks sound incredible.
cardmaster's sounds are nice, but MAYBE a bit on the loud side compared to other sounds.
morgana's sounds are incredible! the only thing is that her voice doesnt quite match the grating, screaming, evil sounds.
everyone's deaths sounds are great, i dont think i've heard any bad ones yet, but i'll let you know. however there was some female voice or other that didnt quite sound like a death sound, but rather an elated grunt as if... something ELSE happened. >.>
i do have to say that i hate katarina's attack sound. i cant stand it.