That's the roaring buzz today. And while @TMobile_USA hasn't followed up on their pre-announcement Cupcake Twitter promise, (at the time of this writing - check the comments for changes) reliable sources say employees have the official start date for over-the-air updates. Oh, and there's a screenshot from T-Mo's Intranet - seen below, thanks to TMo News.
UPDATE: T-Mo's PR is sending out the announcements now, so the cat is officially out of the bag.
I figure a good chunk of the folks reading this know exactly what's coming, but just to clarify, here are some of the primary changes you can expect:
The release of Cupcake may not be an indicator of when we can expect Sapphire - likely now called MyTouch - but keep in mind that the opening for that release window falls on May 13th. Is that a cruel tease, or what? Seriously, I know nothing about when the US Magic will debut. Just sayin'...
BGR has another T-Mobile Intranet screenshot, for those who are interested.