In terms of the upgrades, there is a "raw performance improvement across the board," Hohl said. If you have a supported display, you can play Halo: MCC at up to 120fps/4K on Series X and 1080p on Series S. "
This was a big engineering effort as each game within MCC has unique performance challenges. While there are similarities to the efforts on the PC versions of each game, the work to do this on Series X|S is not always the same and included some unique challenges," Hohl said.
Whether or not you're playing at 120fps, MCC will get various graphics enhancements. Players can expected increased draw distances and an "improved split-screen experience" for both campaign and multiplayer. Hohl also teased that the loading times are dramatically improved. "I can't wait until everyone gets to experience these loading times," Hohl said.