In addition to the features that will be in the HD release, here is what I would love to see if they have time to implement.
1. All extras from the xbox version of Shenmue 2 added. i.e. Comics from the missing boat chapter and photo filters.
2. A main screen menu where you can boot into all of Yu's arcade games, lucky hit, the duck race, and the 70 person battle.
3. Of course transferring saves between all 3 games.
4. What's Shenmue demo.
5. Archive/museum of old promo videos and artowrk.
What else would people like to see as nice to have features?
Honestly, they could release this game on the Atari 2600 and I would play it so I'll take anything.