With that being said, its sad that we have not had any chance on our hand at Prey 2 or Starwars1313.
So, without further distraction, here they are.
-Prey (The original game to our most beloved franchise. If you have not played this already then get off this forum and go do it..)
-Chronicles of Riddike: Assault of Dark Athena (Sci-fi awesomeness with an action/stealth emphasis. Play as Richard B. Riddike in his attempts at escaping 2 different slams.) (Play the included Escape from Butcher Bay first.)
-Hard Reset (Cyberpunk in every sense of the word with a touch of noire. Features old-school FPS style gameplay with a hard-boiled story line set in the future)
-Syndicate (Cyberpunk FPS with a mercenary flare. Features co-op as an option as well.) (There's some interesting emphasis on bio-electronic implants.)
-Singularity (Sci-fi FPS that features time traveling mutants, Russian world domination, and post-apocalyptic war.)
-Far Cry 3: Blood Dragon (80s Cyberpunk tribute with sci-fi written all over it. Features a bio-mechanical arm, laser gun smg carnage, and neon samurai swords.) (Play this game and you'll be even moreso ready for some P2.)
-System Shock 2 (Need I really mention what this game is about?) (Sci-fi horror on a spaceship; controlled by a tyrannical computer program.) (Play it before I do. As I have yet to enjoy its splendor.)
-Deus Ex (Sci-fi/Cyberpunk FPS; notoriously known as one of the greatest PC games of all time.)
-Brutal Doom (Doom, coupled with the greatest mod ever conceived for that game.) (A sci-fi horror action game. Killing demons on mars man...) (If you wish to include the other doom games, (yes, even 3), then so be it.)
-Quake (Now I am just getting selfish with id software). (Another sci-fi shoot-em up with an assortment of monstrous creatures).
-Dead Space Trilogy (Sci-fi horror at its best.) (If you have not played these games then you're missing out.) (Go kill some necromorphs...with style.)
-Blade Runner (A point and click adventure in the Blade Runner Universe.) (What more can I say.)
For now my list is a tad disorganized and rather general in its criteria.
So if anyone has any hidden gems please feel free to offer up those other games that you feel should be explored during the unbearable wait for Prey 2's release.
Thank you.

p.s. Anyone who knows of any games that share a strong amount in common with P2 (that are not already listed here) would be appreciated if they post.