I'd say that AAs to make toons more powerful should be off the table, for the most part.
Like said above, Crafting is probably the most realistic. A crit chance to create a legendary item or something.
I'd say we could also see something like specific abilities that could be used in the new 6 man or raid, but other than that, any new buffs will have to be very minor. A K6 toon with most AAs is already OP.