Here's a neat thing I read about. If you look at the source code of the Rewards page, you can see the hidden reward tiers.
$2.25M - Make a profile, create a friends list, chat with other users on Polymega
$2.5M - A digital cheats database will be implemented for supported systems.
$3M - The Classic Colecovision system will receive a worldwide module release on Polymega
$3.25M - A fully integrated social network for sharing your screenshots and game videos to other players on your Polymega
$3.5M - A new application ecosystem will be created that allows you to create and share custom per-game widgets for on-screen tools like timers, strategy guides, tweaks, translations and more.
$4M - The Classic Gameboy (GBA/GBC/GB) systems will receive a module release on Polymega
$4.25M - An Achievements System will be implemented to Polymega so you can share your accomplishments with friends and followers.
$4.5M - Starting with select games, go head-to-head with other players using Polymega’s online Matchmaking and Netplay service. Create game lobbies, invite friends, and see who’s best.
$5M - The Classic Sega Master System will receive a worldwide module release on Polymega
$5.25M - Create and participate in tournaments using Polymega’s Matchmaking service.
$5.5M - The Classic Philips CD-i System will be playable on Polymega
$6M - The Classic Sega Dreamcast will be playable on Polymega
$7M - The Classic 3DO system will be playable on Polymega
$8M - The Classic N64 System will receive a worldwide module release on Polymega
Unlike the first 6 tiers, there isn't a lot of filler here. There are some legit good features to be excited about. I like the translations and online matchmaking the most. The order is a bit puzzling on some of the modules. Maybe this isn't final and that's the reason it was hidden?
$8M is a lofty goal though. Ouya raised 8.5 million through Kickstarter so anything is possible I guess.