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Starbucks decided to celebrate April Fool's Day by poking fun at everyone who's ever taken aim at the company's "tall," "grande" and "venti" sizing scheme.
The Techcrunch blog has a roundup of the various April Fool's shenanigans making the rounds today: http://techcrunch.com/april-fools-shenanigans/
A tweet from the official @Starbucks account sent at 12:20 a.m. Eastern time announced: "We're listening to your request for more sizes! Order the Plenta™ and Micra™ in U.S. + Canadian stores this Fall." http://bit.ly/Plenta (Notice that they even got a customized short URL)
The short URL goes to a page on Starbucks.com with some hilarious photos of the "ALLEGED" new Plenta™ and Micra™ sizes.
YES IT IS AN APRIL FOOL'S JOKE. Starbucks has not yet *confirmed* the Trenta 31oz. size, although it was indeed tested in some markets.