Regarding the Mystery IP:
As I recall, the statement said two things; an enduring movie franchise, and Frontier's expertise, so:
The IP is most likely Star Wars.
The game, is most likely of the X-wing variety. Elite already uses a flight model that would work well, and it already uses a similar form of the E/W/S power management system that X-wing had. This is something that Frontier could possibly push out (on all 3 platforms) in a year or so (2018 Christmas release, in other words), because the bulk of the work would be the Star Wars art assets, any voice-overs, and the mission structures. Pretty much everything else is already done, including the beginnings of multi-player in at least two different forms.
If Frontier gave me an X-wing game, that fully utilized today's control options and VR, I would have it day one. I'm sure that many others would as well.