Xenonauts: a successful kickstarter project. The game is entering beta on October 9th this year. This date was chosen because XCOM: EU is released that day, and it is hoped that more people will become interested in similar games and pre-order Xenonauts as a result.
XCOM: EU seems to be a more limited, but action-focused game based on the foundations of X-COM. Xenonauts maintains some of the more complex systems of the original. You can build multiple bases, the inventory system is intact etc. So when you've done some research on both games, the XCOM: EU is actually the furthest away from the original experience.
I've pre-ordered XCOM: EU and I'm looking forward to it. When reading up on Xenonauts though I felt that while the production values are lower, the game hits closer to home with regards to bringing back the experience I'm longing for. I hope both games will be good, but I'm naturally interested in the game which involves more features.
Good times ahead for X-COM fans.
Xenonauts is a PC only title.