Square teasing a big Apple hookup

Square Founder and CEO Jack Dorsey just tweeted an interesting little clue for perhaps Square’s big Monday announcement. Apple started selling Square readers in its stores last month.
Here’s our “educated” guess: Apple employees are going to be using Square credit card readers on their new iPad Apple Store 2.0 devices.  See how it all comes together?
Perhaps it is bigger, though?  Did Apple buy Square?  Probably not.