According to iMore, Apple has a plan to next iPhone (iPhone 5S) in August and next iPads maybe the iPad 5 and iPad mini 2 in April. The plan shows the iPhone 5S will be the same basic design as the iPhone 5, with a more advanced processor and improved camera.
With the iPhone 5S, Apple aims to raise the bar in terms of iPhone optics, including a much better camera in essentially the same casing. No huge surprises there, given the past history of S-class iPhones.
There is one month to welcome the coming of April. But the recent rumor is here and there that Apple will announce the iPad 5/iPad mini 2 in April. We can guess that if the next iPad mini does end up getting slated for April, it could be a spec bump, or have something other than Retina as a differentiator.
In additional, you as an Apple lover should have one iPad mini for playing in your hand. If you want to play MKV/AVI movies on iPad mini, Kvisoft Video Converter for iPad can convert videos to iPad mini for you.