"Surface Pro 3" appeared on a Microsoft support page for the Windows 8.1 update
All rumors and leaks in the past one week are supporting the idea that Microsoft is all ready to unveil the Surface tablets and it is most likely that we don’t have to wait for this for too long. It became quite obvious that these tablets are going to be announced soon when Microsoft made an announcement for its exclusive Surface event which is scheduled to take place on the 20th of May and is said to be webcast live. The company reportedly has even sent out invitations for the event and the announcement was even posted on Microsoft's website Wednesday.
It is also being suspected that Microsoft might just launch a smaller, 8-inch version of the Surface which would be the Surface mini, along with an update to its current Surface Pro. However the latter is only a rumor and is also being the name of "Surface Pro 3." But something has fueled up this rumor; text specifically mentioning "Surface Pro 3" appeared on a Microsoft support page for the Windows 8.1 update. Though the text has disappeared but it has added enough to the speculation.
A spokesperson for Microsoft has later told Microsoft-oriented site WinBeta that the text was a typo. "An earlier version of the KB [Knowledge Base] article included a typo ... To avoid any confusion, we’ve updated the KB article to correct the typo and better convey the information as intended.”