This past weekend they confirmed Alexandar normal will be able to be beaten in a day or two.

Alexandar Normal loot and Alexandar Savage loot will be different tiers of items. Normal mode will work on a WoD system where you can take 1 drop per week. Savage we don't know the details of, other than "similar to the new primals token system but not identical".

Normal is basically your story mode. Savage is the new top-tier raid.