I recently went IG into the Rift (Vrebel, Griff and Dot) after the new update and noticed some areas are still without magic:
1) The area right after the diamonds were you have to swim. It includes a water elemental, gargoyles and one deposit of diamonds after you go through a large wooden double door,
2) The area past the adamantium and mind flayers were you fight two giants and then a water elemental and later on gargoyles, a swim AT is at the end.
The very begining of the Rift does have magic returned and we noticed a tweak in the creatures there as well.
I thought I'd bring it up just in case this was not what was intended mechanically.
Dezza thought I should post it as a bug after I pm'd him about this issue.