The new cogbot update is here, new bots with a spinning blade that gets faster as you collect more powerups.
Here's a video of them in action:
and here's a video showing the very latest update, with spark effects to make it even more awesome:
I also updated the BotSumo main trailer (the one that shows on the app store) to show the new bots, as it hadn't been updated in a while so didn't show the variety of new robots: