I'm really excited about this new patch but ... My understanding is that once you dial up an MP, even if it's MP1 or MP2, all mobs become level 63 mobs. In which case, they all have the potential to drop ilvl63 stuff and they all award lvl63 XP for our paragon leveling; right so far? So, other than the personal satisfaction of killing something at MP10 (personal satisfaction, probably being the 2nd most important aspect of this game), there is no other benefit from loot drops, XP or gold, right?
also increases mod difficulty
also increases chance to get a key from keywardens, organs from ubers, 10% per mp level, 100% at mp10
The bonus item only drops from normal mobs, not from elites.