Tetsuya Nomura breifly talks Remake Battle system.

[Sephiroth]

The additional missions in Crisis Core heavily suggest Genesis and the goddess Minerva are way more important to the planet's business than might initially seem. So yeah, they might as well retcon the hell out of that and make Genesis a big deal.

If anything they get slight hints. Genesis and Minerva are more the stuff for the sequel. After all DoC's secret ending, CC's ending, Sephiroth's Watashi wa omoide ni wa naranai sa and the comment in 2008 that "the compilation's finale will need another form" show enough. I suppose the Remake will either have hints inbetween or as a secret ending that there will be something in the future that is not just AC, OtWtaS, DoC, et cetera.

And RE Remaster is exactly that. A remaster. No remake.