I think Ubi always had the right to "the next sim" by Oleg, for all these years.
I think Oleg didn't give mch information and developped the game without interference from Ubi. Ubi didn't care much, being busy with many other products.
I think that when Oleg & Co thought they had a product that they could show to Ubi, they did.
I think Ubi & Oleg agreed on a release date and on the wording of the press release.
I think Oleg posted the press release on this forum about an hour earlier than Ubi, probably on purpose
I think guys in charge of the game at Ubi are still somehow lost, not having a lot of information, and probably not that knowledgeable on flight sims anyway.
All in all, if it works out like IL-2, both Ubi and Oleg&Co will be happy.