Affixes on items will now roll their level based on the level of the monster killed (rather than the item’s level)
Wyatt Cheng: You can get item level 63 stuff in all acts of Inferno when Monster Power is on. The moment you go into Inferno with any kind of Monster Power, all monsters become level 63, and they can now all drop item level 63 stuff the same way that Act III and Act IV Inferno do now. However, cranking up Monster Power beyond MP1 does not further increase your chance of getting 63 stuff.
Important to note that currently: all rings/amulet max rolls are ilvl 62.