The loot we've seen so far has come from marrowgar, gunship battle, rotface, festergut, saurfang and trash. (couple of 10man items from queen lanathel
That's five bosses out of twelve. Atleast half the loot should still be unseen. There's plenty of hope for good items
Also, all the loot from those bosses has possibly not been seen. Very few items from saurfang for example (could also be because of t10 tokens being a part of the loot table, in which case the rest of the t10 tokens will drop from bosses we don't have a loot table for yet).
Also, if the loot rules follow toc, which they seem to do, all the 10man stuff will have the same drops at ilvl 264 in 10man hardmode.