Forza Horizon 5 definitely will be, and it will be a Play Anywhere title - it’s a Xbox Studios game.
BF2042 will be, but in limited form. You’ll need to have the EA Play add on subscription (or Game Pass Ultimate sub, which includes EA Play) and then you’ll initially have access to the Standard edition and be able to play for up to 10 hours. Then either buy the game (with a small discount) or wait until it gets added to the Play Library later on - 6 months + generally.