A fan takes the Adventure Mode scaling monster thing to its logical extreme and gets a Blue reply of grudging and temporary agreement.
Grimiku: Adventure Mode is still being developed, so please keep it in mind that this could quickly change. Let’s use the example you gave where a character plays through Act I, and unlocks Adventure Mode for that Act. To answer your question, yes, that character could level all the way to 70 by repeatedly playing Act I Adventure Mode, since the monsters would level up with you. I want to reiterate the fact that this is still being developed, though, so stay tuned for more information along the way.
Some readers in the 100+ comments for the new difficulty info post were asking if you could just start at level 1 and go kill Diablo in Adventure Mode. No, for this reason; you have to finish an act in Campaign Mode before you can do it in AM. That just leaves open the question of rushing and cheesing, though. What if you get rushed all the way through Act 5 and you’re still say, level 11. Could you then do AM in all five acts? Presumably yes, but would the enemies all scale to your level? Or is there some minimum level they won’t scale below? Also, related topic: how does scaling handle in a multiplayer game? Based on the level of the character who creates the game, even if others join who are much lower or much higher level?
Elsewhere, a fan asked if the green backgrounds behind set items in inventory are a for real improvement in RoS, and if set items when dropped will show a green beam of light. Yes and yes, says Grimiku:
Grimiku: I just wanted to confirm that dropped Set items now have a green beam instead of an orange one. I was lucky enough to actually see it before I heard that the change had been made, and it was a nice surprise.
I can’t confirm this from Blizzcon demo since while I saw many dozens of legendaries drop, they were all legs and not sets. This is because the demo characters were only level 33, and furthermore, because Legs/Sets in RoS do not drop with their level scaled down to a character. Only scaled up. So at level 33 killing a level 33 monster you are eligible to find any level 1-32 legendary items with their stats scaled up to 33, but you will never find any level 34-70 legendary items scaled down to 33. And there aren’t any findable set items with levels below 60. (They could in theory add new lower level set items like they did with legendary items, but I haven’t seen any in datamining yet.)
During Diablo 3 Console development it was possible to find high level legendaries scaled down to lower levels, but I think that’s no longer the case in live. It’s not going to be possible in Reaper of Souls, though, for any platform.