Oh, Sega! You cheeky, cheeky monkey! Thought you could pull a fast one on us, did ya?
Tucked away on Sega of America's Flickr photostream is a trio of Super Monkey Ball screen grabs, all tagged with "PS Vita." As far as I'm aware (let me know if I missed something), Sega has not officially announced a PS Vita installment of the bananarama arcade series. Consider this stealth reveal a pleasant surprise this weekend!
[Thanks for the tip, Shadzter!]