Where are you getting that from Jamos? They were just talking about it at Eurogamer, and I didn't hear any ofthose changes you listed.
Also, it's always been said that higher level gear have more mod spots. So while you could use a lvl 10 piece at level 50, it won't be as powerful as a piece you get at lvl 50 due to having less mod slots.
I'll bet my collector's edition that he was misquoted. No way in hell are they changing it to only a few sets after going into so much depth about it at PAX and Eurogamer.