In my opinion the puzzles should be way harder, I truely miss those old school hardcore puzzles in games where you actually have to think.
yeah, I think Tomb Raider (not the new one, it was great but it lacked in the puzzle department if you ask me) usually has awesome puzzles, especially those in - the tomb raider 1 remake - Anniversary
I think if any villan could return it should be Talbot or Dante. Most people put the pieces together that the villan from golden abysscwill feature in this installment, but if this is 15 -- or less years after the events in UC3, Talbot could have a chance to come back. I also think it possible for Narravo making a comback if it was possible to escape from his binding to El Dorado, but this is Uncharted so you never know.
Talbot will come back as a Djinn
As much as I like action, I want puzzles too. There's tons of shooter games without puzzles anyway.
There should also be many more hats such as Glasses Top Hats Beanies.. ect, and these hats would have stats true to the hat's function, such as a pair of sunglasses with 2% less screen glare and glasses having 2% more aiming accuracy.
And,as a last thought, there should be an in-game store which has heros included, so even if you are Drake, you can play as Sully, and so forth.