Honestly, if you went Destro, it'd likely be Incinerate spam.
0/41/30 might be an interesting raid spec, though... I'm not sure what
3 talent points i'd give up on the felgaurd... but it would be a
decent build. I'm currently 0/44/17 on my lock for various reasons.
You'd be giving up the 15% shadow buff from sac pet, but you'd pick up
all the fun bonuses that go along with having a felguard out.
As an old affliction warlock, I have to say that it's nice to see DoTs
looking more viable. I don't think it will ever be a good enough spec
for raiding. Really, they should have a Shadow tree, Fire Tree and
Demo tree. When I'm specced full Destro (21/40) I can pump out as much
DPS in fire damage as I can in shadow, it all depends on my rotation
(and whether or not we have a scorch mage).
The Warlock changes don't look bad, but they don't look great either.
I'm going to be interested to see how they turn out (and I don't even
think we know what the 51 point affliction talent is yet)