The contest is called Windows Phone Next App Star and it was launched yesterday, 14th January 2013. It is open to Windows Phone developers worldwide. Its easy to participate; registered developers can just visit Dev Center to opt-in* by March 5th, and your catalog of published apps will be entered for the competition.
If you havent yet developed a Windows Phone app (or you want to make tweaks to an existing app), you can register today and publish your app by March 5th to participate (note: your app must be published and live by March 5th to participate).
There will be thousands of dollars in prizes for the developers of the 64 apps that get selected, including a Nokia Lumia 920 Windows Phone and a one-year free Dev Center subscription. The last app standing will win the Next App Star challenge and the grand prize of placement in one of our Windows Phone primetime TV advertisements in the U.S., bringing national exposure and a lot of buzz to one developers creation.