Microsoft Office 15 M2 Build 15.0.2703.1000 finally leaked!?

Twitter user AngelWZR sent a sensational tweet couple of hour ago! Along with a link that leads to a Russian forum that has the download link for the 32-bit version of Microsoft Office 15 M2 Build 15.0.2703.1000!
Is it really Microsoft Office 15 M2 Build 15.0.2703.1000? If it is genuine, then this is our chance to see how Microsoft Office would look like in its next release (Microsoft Office 2012