If I played on console I'd want 1080p@60fps, or at least as close to it as possible.
As I'm on PC those bullet points are already achievable (and beyond). So, thinking invested yet reasonable (eg: no additional content / massive gameplay overhauls), I'd like to see from a trilogy port:
- Seamless narrative between all three games, avoiding menus and whatnot.
- Abso-fucking-lutely all the DLC and extra content bundled in. Every bit. No leftovers.
- DLC content optionally added to stores instead of dumped on the player when they boot the game. Properly integrate guns/armour DLC into the adventure.
- Improved textures while remaining 100% faithful to the original art. Might be too much work. JeanLuc's texture pack for ME2 is a perfect example of how to do it right, and how it improves image quality.
- Additional graphical polish/fluff on shaders and post processing to take advantage of modern hardware. EG: Improved shadow resolution/complexity, god ray sampling, etc. Anything the team would be willing to invest time in. Like ambient occlusions.
- Controller support. I wouldn't use it, but others would appreciate it.
As with all "next gen ports" the rock and a hard place will be with the PC crowd. For example, I own all three games and all the DLC. I've played the saga religiously. At 1080p 60fps. With SGSSAA cleaning up the aliasing and forced high quality 16xAF. In short, visually I the game has already looked leagues better than the 360/PS3 build and, additional shaders/textures aside, better than what a next gen build would look like. My money has already been spent.
Eidos' upgrade program for Human Revolution to the Director's Cut left me happy. It had many, many issues, but the price was low given I already owned Human Revolution and the DLC, and the extra content seemed worth the investment. Seamless DLC integration, tweaked AI and skills, and the super awesome developer commentary (of which there was a metric shitload, almost all of which deeply informative).
So if all a "next gen port" turned out to be was the base three games and DLC meshed together as a cohesive experience, running at 1080p@60fps on PS4/Xbone, then as the PC market I'd be pretty under whelmed.
Sweeten the deal. Maybe it's too much to ask, given something like Human Revolution and Tomb Raider are just one game and this is
three. But in my opinion the best ports to a new generation of hardware are the ones that either introduce massive, impressive overhauls in visuals/presentation
beyond just resolution and framerate, or those that include a wealth of supplementary content that was previously unavailable (eg: developer commentary) that warrants another trip for familiar players.