These are the two games that I would insta-buy as Vault Editions, so as long as they both get done eventually I'm not chuffed which comes first.
For Tron, I hope they go the same premium route as SMVE and get the fiber optic ramps, Daft Punk mulitball, etc. in there.
For LoTR, I think a re-design with new hand-drawn art for PF, backglass, cab, etc., could be pretty amazing.
I'll buy both pretty much no matter what for the game play.