A few I'd really like to see: Resident Evil 2 Shenmue/Shenmue II Scud Race Virtua Fighter 3 Vectorman Crash Bandicoot 2 Wave Race 64 Some of these could just be HD versions of the original games.
I will second every one of those. Hopefully Sega wouldn't mess up Vectorman like in the first remake they were working on.
I think it'd be cool if they did a 2.5D style (or whatever you would call a game with 3D graphics but 2D gameplay) remake of Vectorman. The game tried to do some things that could be done better on a modern system, like some of the "lighting" effects for example. It would be awesome if they did that and had Jon Holland (who did the soundtrack for the original) do an updated soundtrack.
Two XBOX games. Jet Set Radio Future, it desperately needs an HD remake, and Kung Fu Chaos, a party game mixed with Stuntman, incredibly overlooked and fun game, but it didnt have even progressive back in the days (the demo had, weird world).
I'd love to see Wipeout 2097 remade in the style of Wipeout HD fury, but that's probably never going to happen now that Studio Liverpool are no more. I'd also love to see remakes of Resident Evil 2 and Panzer Dragon Zwei. Oh, and Wonderboy in Monsterworld in a 2.5D New Super Mario stylee. And while I think of it, why not a complete remake of the original SNES version of Super Mario World like that as well.
Timesplitters 2 and Timesplitters: Future Perfect. Not so much for graphics or gamplay (both of which are still fine in these regards, so why bother? I still play them on my XBox), but so that the map makers can be improved to have (much) bigger and more detailed maps. The map makers were great, being a good compromise between power and ease of use, but since the maps were all compatible between the original Xbox, Gamecube, and PS2, then they had to allow for the lowest system memory (the PS2), so the maps you could make were very limited. On the current consoles, the maps allowed could be huge, plus you could have the ability to select any in-game textures instead of just the fixed themes for the environment. Even better, they could allow you to use the single player levels (and the much more detailed multiplayer maps, such as Streets and the disco) and create single player campaigns by creating your own objectives and placing them and the friendly/neutral/enemy NPCs wherever you choose. That would be fantastic! Edit: It would be nice to have the original Timesplitters too, so that we could have a Timesplitters trilogy pack, but since TS1 is so inferior to the other two games, then I doubt many people would complain if it was missed out.
There's a remake underway at https://www.systemshock.org/index.php?topic=6977.0 There have been a few remakes started, but none of them ever got very far before being abandoned, but hopefully this one will be completed. The author is aiming to release it by the end of the year, so we hopefully won't have long to wait. For now, we can play System Shock Portable (an all-in one DOSBox + System Shock + mods package), which removes the problems of running System Shock (which is DOS only, and has a high base memory requirement, and (IIRC) doesn't like a lot of DOS TSR stuff, so System Shock Portable is brilliant just for solving those problems), adds proper mouse look and re-definable controls (as opposed to System Shock's non-standard controls and odd (to modern gamers) form of mouse control), and other things too, such as higher screen resolution and fixing things like the recorded messages where the text and audio don't match. A brilliant way to play System Shock, though maybe this remake will be even better. Wasn't the Gamecube Wave Race game a good sequel? I don't know, as I never played it.
The map maker truly was a blast... although I must say I spent more time with the park editor in Tony Hawk's Underground and up, and still mess around with those games from time to time. Being able to make actual exteriors in TimeSplitters would be great... also, having an option to edit in full 3D would be very helpful as well. My biggest complaint with TS3 mostly boiled down to not being able to play story maps co-op (could probably be bypassed with hacking, though), and not being able to create friendly AI characters. GameCube actually had the biggest problems in regards to the mapmaker. Map memory was lower than Xbox and PS2, and both TS2 and Future Perfect were prone to crashing if maps were overly complicated.