The deal was always only for the Holidays only on XBox, anyone thinking that MS got the rights to control the franchise or even just this release for any length of time is sorely mistaken, that makes no sense when Square Enix are the ones that paid out for the franchise ages ago from Eidos.
The deal may have barred SE from putting it on other platforms for X amount of time, but likely under the proviso that a certain amount of sales were met for the game on the platforms it was exclusive on.
The previous comments about it coming in Early 2016 likely refers to 2016 financial year, not calendar, so this is earlier than expected.
I doubt we'll be waiting until Fall 2016 for this to come to PS4, more likely a month or 2 after Uncharted 4 releases, or before Horizon, because those 2 games are the competition for RTR on PS4.
The longer that SE waits to release it, the fewer sales it will get because there's a lot more fresh and unique games that will stand out from TR.
