Sin and Punishment is just not very good. A joke, really.
Phantasm still needs to provide short duration snare/root immunity, and/or I'd actually like to see it break stuns. Ret-spec BoF has been breaking stuns for two years now, and can be applied to teammates.
Imp Psychic Scream is still garbage, and still needs to be unlinked from Silence.
I really wish Paralysis proc'd from all Mind Blasts, not just crits. It has potential, but requiring 3 seconds of cast time to set it up just seems awkward.
Apparitions are still a stupid mechanic, and I'll be both surprised and disheartened if they make it through the beta in their current state. The way it stands, PvE DPS will require spriests to dance back and forth while GCD'd (such as the 1.2-1.5 seconds after DP etc) in order to coax a proc, and this is just unintuitive and awkward gameplay, the very kind Blizz has tried to kill in the past (rogue weapon swapping etc).
Orbs are okay, but I wish they weren't consumed by Mind Spike. If it were just Blast, you could build up three orbs and then go spike+spike+HUGE instant blast. Because of this, it seems like there's a slight conflict of design, where between Mind Melt and the +30% crit stack per Spike, the intention seems to be that we cast spike a few times then Blast, but if orbs are all eaten up by the first Spike then that combo loses its rhythm. Meaning, instead of the cool rotational rhythm of "spike spike spike BLAST!!!," it's more like "SPIKE! spike spike Blast." Does that make sense? Probably not.
I guess my use of the word Offal was pretty extreme. Shadow still has problems that need fixing, but it's not garbage.
My main complaint is that mages and warlocks are still ten times the cloth dpsers that we are, and while they're evolving dramatically for Cata, we're just getting a few minor tweaks and small toys.