Although not outright confirmed, it appears that both Mega Man: The Power Battle and Mega Man 2: The Power Fighters are headed to Capcom Arcade 2nd Stadium.
Twitter user @Alumia_Italia, who regularly keeps tabs on backend data from the Microsoft Store, found images for several games slated to appear in Bundle 1. Chief among them are Power Battle and Power Fighters.
Pending official word from Capcom, we can't say for certain they're in. But, honestly, it wouldn't be totally unexpected. Perhaps we'll learn more during Capcom's Summer Showcase next week. The event is expected to feature news and updates on previously announced titles.