K-ON Season 2 Sets for April

Yup it was announced as having an April airing.

The official website has also confirmed that the main staff and main cast will return from the first season unchanged.

The second season of the K-ON! anime franchise was announced after the "Let's Go!" live concert in Yokohama last month. When the concert's two encores ended, the large onstage screen displayed footage from the first season of the television anime series. Then the screen displayed an announcement that the second season has been green-lit!

Source: Sankaku Complex, ANN