I'd like to see some Eastern Sun-style features; I found the gem/rune stockers to be very useful, and since we already have shrine stockers and apparently arcane crystal stockers (arcane clusters), it'd be cool to see that extended to those other types of items (maybe signets and others as well). Additionally, the tokenizer, which allowed you store your gear in 1x1 item (then get it back when you wanted to use it), would also help if stash pages aren't coming soon.
Obviously, I don't know how hard it would be implement, but it's stuff that I'd be happy to see.
Also, I know it's been mentioned many times, but if stamina could be removed entirely and running penalties removed, that'd be really cool.
On a personal note: my favorite item was the SSU Labrys, Wotansvolk. Please it bring it back.