Windows Blue, Windows 8.1, Windows 8 SP1... whatever Microsoft wants to call it, it's coming soon. And along with it there will be updates to its RT and Server products too. References to Windows RT 8.1 Preview and Windows Server 2012 R2 were found buried in a DLL of a leaked build of Blue. (Build number 9374, to be specific.) The mentions turned up in basebrd.dll.mui, if you're wondering what file to start rifling through. Don't get too excited, though: there's basically no info to glean other than their existence -- which is no surprise at all. Hopefully all of the much whispered about updates will arrive sooner, rather than later, and pack a few tweaks that will make the Microsoft faithful feel a little bit more at home.
Source: @Windows4Live (Twitter)