According to Middleagegameguy, this Gears of War remastered collection has actually wrapped up its initial development. During the latest episode of the XNC Podcast, the insider said that those within Xbox are now in the process of testing the Gears of War remaster and that the games contained in the bundle will all be seen within Unreal Engine 5. Other than this, it's not known when Xbox might look to release the collection, but it was said definitively that this remaster is very much "real".
(FYI) According to @Middleagegamegy, The Gears Collection is being internally tested by The Coalition— Idle Sloth💙💛 (@IdleSloth84_) January 13, 2024
The build is finished and the game testers are currently playing it now
Also, The Coalition New IP is still being worked on and Ninja Theory is still working on Project Mara… pic.twitter.com/vOnRREF4J8
Obviously, given that this is just another rumor in a long string associated with such a Gears of War collection, be sure to take what has been expressed here with the typical grain of salt. Given how long it has now been since Gears 5, it would make a fair bit of sense for Xbox and The Coalition to release some new remasters of older games to help bridge the gap to the inevitable Gears 6. Additionally, one prominent developer at The Coalition teased in recent weeks that 2024 could bring with it news associated with the Gears of War franchise. Still, until we hear more in an official capacity from Xbox, don't expect this to be legitimate just yet.
Related Forum: Xbox Forum