XNA for WinRT
I've written several games for WP7 using XNA or XNA/Silverlight hybrids. I have thousands of hours invested into that codebase. Unless XNA works on WinRT, I won't be able to port my WP7 apps over to WinRT.
Shaun Tonstad commented
It isn't enough to have a third-party fill in this hole left by Microsoft. The Mono project does not offer the level of polish or care and feeding associated with a Microsoft release. This is not a technical roadblock for Microsoft, it is political.
Dean Ellis commented
For the 107 people intersted in XNA on WinRT, the MonoGame project already has a number of games in the windows 8 store. ARMED being one of them (http://apps.microsoft.com/webpdp/en-us/app/armed/a080e316-b7ff-4d81-831c-2967a9c2357d).
If you want to port your XNA games to metro, the develop3d branch MonoGame can help you do it.
Matt Whitfield commented
Guys, in case you're not aware, the monogame team have XNA -> WinRT compatibility on their roadmap
MS! Please tell us. What will be the feature of XNA?
What will be a feature of Silverlight?
What will be a feature of Metro?
What will be a feature of WinRT, WinRP?
Lars Kemmann commented
Agreed, @che! Compatibility has always been Microsoft's secret weapon for solving the chicken-and-egg problem of new platforms - so it would be crazy for them to ignore XNA on WinRT. I hope to see this available in the next 6-12 months.
It seems like there is a great opportunity to narrow the app gap by making all the existing XBox Live games run as Metro apps, not to mention all the WP7 XNA games.