Is this gonna end up being the 4.0 BLM thread, or should I dig up the proper one?

I'm still only at the end of ARR, so most changes don't seem like they'll hit me, and I can at least sorta just learn the new mechanics as they come, rather than relearning. Might make educating via guides a little troublesome.

Just looking for a little clarification to at least keep myself in decent shape where I'm at, until I get a better grasp on all the changes.

Thunder: Instead of casting Thunder I and using procs for Thunder III, it's basically all Thunder III now? Or Thunder II for mass trash I suppose?
AoE: Can't really do anything about potency loss, so Fire II and Flare still standard for AoE?

Sounds like most of the bigger changes are all post-50, so I at least have a little while before I need to adjust, which I hope won't be too bad going in fresh. Mildly upset that Sleep doesn't AoE, but no big deal I guess.