Rumors have been buzzing all around the Internet today that Apple will be refreshing its line of iMac computers this Tuesday. The new models are expected to get Intel's new Sandy Bridge processors and Apple's new Thunderbolt high speed I/O, first introduced in the MacBook Pros a few months ago. The last iMac refresh was in the summer of 2010 and they are due for some updates by now. Fueling this rumor are numerous reports from people who have purchased an iMac as far back as two weeks ago with a ship date of around May 4th.