Is there going to be a sequel?
Yes, if I have my way. :) I've written one, anyway, but it still needs some edits and my agent's stamp of approval before we start the whole publisher dance. I have faith in Little Book #2, though. It'll be out there someday. Until then, you'll just have to be patient.
Will an audio book version be available?
Up until recently I answered that question with a shrug and an apologetic 'dunno'. But then Tantor Audio came along and snapped SERENGETI up. :) Now I can proudly say that an SERENGETI audio book is coming, with voice narration by the multi-talented Elizabeth Wiley.
The official release date is 26 April 2016, but you can pre-order it now on Amazon or the Tantor website if you're impatient or forgetful.