First of all, Apple may have already booked the stage for an announcement on January 26th, 2010. The company has rented a stage at the Yerba Buena Center for the Arts in San Francisco for a few days in late January, according to some reliable sources. Analysts and the rumor mill strongly believe Apple will soon launch the must anticipated tablet here.

Then, according to the Business Insider, Apple has reportedly been telling some developers to prepare their apps for a demo next month:

“They’ve told select developers that as long as they build their apps to support full screen resolution – rather than a fixed 320×480 – their apps should run just fine.”

The tablet device is not expected to go on sale in January; rather, it will only be demoed. Presumably this is so other developers have an opportunity to update their apps before launch. Business Insider thinks its likely that Apple will unveil tablets in several different sizes over the coming months.

Finally, a very connected source has told BGR that they have very solid information about Apple’s upcoming tablet:

It has been widely reported recently that the size of the tablet is 10″, but there was also talk about a 7″ model. Our connect said there is 100% a 7″ Apple tablet, to be announced in January, and whether this is in addition to a 10″ model, they don’t know. Would we bet the farm on this? No, but they’ve been amazingly accurate for us in the past and as usual, Apple rumors seem to get more interesting…