Hi - long time reader, first time poster.
Not a lot of info to evaluate yet. The ISB change sounds interesting. It won't be an afflic talent anymore, true, it will however give meta/ruin increased raid viability. I'm a big fan of that build, so any love there is a good thing in my eyes.
The change to siphon life seems to be excellent, ofc depending on whether or not SL will still provide a boost for soul siphon. Hard to say without more exact information, really.
There's a tiny stealth-buff in the priest section too:
Divine Spirit – this spell is now a core ability available to all priests.
Granted, a lot of guilds have a disc priest along, but I can't really see this as anything but a buff for warlocks as well. Now we're basically guaranteed divine spirit
Gotta admit I'm aching to hear what more they're planning.