Our pals over at PocketGamer are all over the Unite 12 conference in Amsterdam, which is apparently the place to go if you're in to the Unity game engine. Unity CEO David Helgason mentioned while speaking at the event that Unity will be coming to both Windows Phone 8 and Windows 8. Support is currently scheduled to land sometime in the Unity 4 release cycle, which should be encouraging news for all Unity developers.
I know what you're thinking, Mr. Angry Internet Commenter. This is an iPhone site, we shouldn't be reporting on Windows things, but try this on for size- Unity is turning into one of the biggest game engines out there, and a ridiculous amount of iOS titles are currently utilizing it. This sort of support just adds more bang to the proverbial development buck as developers are going to be able to target an additional two platforms in the same development environment. Hitting more platforms could mean bigger-budget games thanks to a larger potential customer base, wider pools of online players to play against in games with cross-platform multiplayer, and a bunch of other potential benefits that could trickle up (or down) to the App Store.
In the meantime, if you want to learn more about making games in Unity, the best place to start is the Unity web site. Alternatively, if you just want to check out a cool Unity game, Dead Trigger [Free] is a fabulous tech demo of what the engine is capable of.