XCOM: Enemy Unknown rebooted the X-COM and brought the series back into the public light back in 2012, and when the sequel, XCOM 2, was announced this year, people were excited to get back to fighting aliens and dealing with the hectic back and forth cover/strategy gameplay. However, it was announced by 2K Games today that the game will be delayed to February 5th of 2016. The cited reasoning behind the delay has to do with the improvements that they want to make to the series, and the additional development time that will be necessary to hit their expectations. As stated by the XCOM 2 website, "We've set a high bar for the sequel and the entire team has been working hard to make sure we deliver a great follow-up to Enemy Unknown. We just need a little more time to make it the best possible game."
The game has only been announced for the PC (being one of the only PC-exclusive AAA games out there), and while the turn-based strategy game did have depth, it sounds like XCOM 2 is attempting to bring that gameplay to the next level, with of course, snake creatures, and additional combat complexity. Specifically, Firaxis has indicated that they wants a bit more depth, more replayability, and more investment in the soldiers that you end up putting hours and hours of training into.