From the PlanetXbox360.com feature list:
"The Xbox 360 gaming calendar for April 2012 is looking pretty sparse, especially compares to the packed February and March months we just had. Of the few games that are being released this month, there are still some high profile titles. The Witcher 2: Assassins of Kings makes its debut on the Xbox 360 this month, as does the Xbox 360 exclusive Kinect Star Wars. Prototype 2 is jumping into the mix as well, but even with these triple-A titles making appearances, April is looking pretty dry. Maybe that will make it easier to figure out what game you want to buy this month or maybe you'll just save your money and play Mass Effect 3 until May. The list of notable titles below should make your decision much simpler."