What would you like to see in the game.  What enhancements over the original?

I'll let a few of you answer first before I come in with my opinions.

Less cartoony feel.

Uncharted 2 would appear in 2009. Would be great news if it is announced at E3 for PS3 owners.

I loved the game, but I felt there could have been a bit more openness in the levels to do some exploration to find the treasures. The game was a bit of a corridor. A beautiful one, but a corridor non-the-less.

Edit: also I was not a fan of the gameplay changes in the last few levels...

definitely online co-op through the whole campaign with a buddy,,,,I also want them to work on a 50GB disk for a few tweaks to the graphics and longer campaign ,,,,more of the vehicular scenes with jet ski and car ,,,,

I also like them to stay in a beautiful jungle type place like the first one.abit more variety in the enemy if it suits the story line.

that's it,,,but he main thing I would like to see is the campaign online co-op.

Online multi-player, 4-6 player co-op campaign, longer story, better graphics (obviously), and I guess that about covers it.

• Multiplayer Levels with large maps
  
• Longer Single Player Campaign
  
• Bigger levels with more areas to explore
• Online Co-op
• More varied enemies with differing AI
• Better Water Barrel Explosions
• More Underground Water Levels
• More enemies on screen at the one time
• More types of weaponry
• More vehicular sections
  

Longer single player campaign.
Interesting story.
Better player movement (Prince+Altair are much more agile and fun to play)

I don't care about the vehicle sections, if they can improve them it would be fine. Uncharted was an interactive movie. I hope they have not used resources for multiplayer. Games shouldn't try to do everything IMO.

Varied environments.

I thought it was long enough, but then I rented it. I do think they'd change the environments more, but I thought there were quite a few different looking buildings.