http://store.steampowered.com/app/425540
The upcoming expansion for Awesomenauts is now available as a pre-order on Steam. Get immediate access to 3 new characters when the Overdrive expansion goes live, and get a Clockwork Yoolip skin as a pre-purchase bonus!
https://www.youtube.com/watch?v=wD70BQsSsTU
Yoolip, Chucho and Jimmy are the premium part of the Overdrive Expansion. Other content coming with the expansion, such as the new matchmaking, mechanics improvements and the (Lonestar) character overhaul, will be available to anyone, regardless of wether you purchased the characters.