looks nice, much improved graphics.
As to compatibility with the current expansions, I do believe you could use the Sauron expansion if you have the original LotR set as you use the orignal tiles along with the red tiles from the sauron set instead of the new tiles from this set which look smaller.
According to the advice for card sleeves, the cards in this new set are the same european standard size as with the old sets. But even if they where not it wouldn't be a problem as the new cards from sauron don't get mixed with any of the decks from the base game.
The resource chits will probably (hopefully) fit on the new boards.