Hat off to you Team Spriter for making such a cool contest
You should post this news on Twitter (#indiedev #gamedev #pixelart), TIGSource Forums, Pixel Joint Forum etc when you finalize all of the details, as there will be alot of interest for such a high prize! There will also likely be fame and work offers for the winners.
p.s. please slow down the framerate of the gif at the top of this page, it advances every 2 seconds, should be something like 5 secs so you can read the text