Nah, win9 had been developed by different branch for quite a while. But as seen from AngelWZR's tweet, 9729 still has the 6.3 kernel.
Microsoft has been talking more and more about decoupling consumer and business/server versions of Windows, so the consumer versions have a much faster release-and-EOL cycle, so ultimately the Windows XP debacle doesn't happen again. By decoupling the two release types, businesses will no longer have to worry about upgrading as much, while consumers -- especially gamers and tweakers -- will have to worry about upgrading more often. This would also work out very well for the consumer OEM market too, where a more expensive computer running Windows 7 may be a strong selling point over a computer running Windows Vista, even if the hardware isn't a significant upgrade. And finally, non-Microsoft Windows developers making critical products like Flash and Java would no longer have to worry about needing to support decades-old consumer Windows (decades-old business installations would get timely security patches anyway). It'd be a huge monetary plus for Microsoft, the OEMs, and various to do this: remember Windows XP was released in 2001 and just EOL'd this year in 2014, which is a ridiculously long run of free support for a closed-source monolithic operating system. Of course, this would mostly be a loss for consumers, although one would hope Microsoft would no longer demand $80+ for an *upgrade* to something like Windows 9.
Good to see they are differentiating between touch and desktops...still don't see the necessity for Metro in Server tho'... also don't get the bios angle regarding cloud-based files... they may have all user docs default to onedrive but how determine sign-in from bios? Any rumours regarding Win9 being free would prob. only relate to OEM's anyway - doubt 8.x will get a free update...