I was not wrong but some of the details I had backwards. Yes,we will get a preview of KeyLimePie at Google IO 2013.
However, the release that is coming out in May 2013 is Jelly Bean 4.3. At least to the data leaking out about Google testing 4.3.
I do not have any feature specific details. I would like to see SQLcipher supported but I do not think that might be until Android 5.0 or Android 6.