Developers Team Meat revealed in a blog post
some exciting news concerning their XBLA title http://www.trueachievements.com/Super-Meat-Boy-xbox-360.htm
To commemorate the game's one year anniversary (which was October 20th if you're sending a card), the game will be receiving an update next month, which will add "tons" more levels in the 'Teh Internets' area. These levels are being added free of charge. What's more, the game will be going on sale sometime in November as well.
Although the levels are free, we only know that it is coming in November, with no exact date set. Same goes with upcoming sale, we no neither the sale price nor the exact sale date at this time. Super Meat Boy
currently retails for 1200 MSP