There's another build out for the fast ring, along with a new build for Windows 10 Mobile -- nothing really extraordinary about the PC version, though it adds multicasting to the Edge browser. [Of course casting from a PC/laptop isn't that hard -- having something that works at the receiving end OTOH... I don't think it's going to overtake the Chrome browser casting to a Chromecast any time too soon.] And the Insider build still won't work on small tablets.
Most everything else is spin & what may be seen as a threat...
It seems that no matter the question or concern, the answer out of Microsoft is some combo of Windows 10 & Microsoft's new hardware. My take is that there's not an awful lot that people need a full PC CPU in tablet form to accomplish. It can be really useful for things like music creation when/where a regular PC or laptop might get in the way, but then the software to accomplish that using a touch screen is written for the iPad. There are plenty of apps for pretty much everything tablets are really great at, but only from the Google or Apple stores -- some of the better apps are even pulling out of the Windows store. So you're left with regular Windows software, which is great, unless you're trying to run it without a mouse. The proposed ideal solution of course is to add a detachable keyboard with a touchpad, making it in effect a laptop, only one that you spent maybe $1000 more for.
Despite that and some problems I'd be pretty upset about if I spent that kind of cash, Windows fans & Microsoft can't stop talking about how great the new Surface products are. Now apply that same level of spin to Windows 10, and you've got just about everything new that's been published this week in a nutshell. You've also got Microsoft's justification for the threat...
They're going to get more aggressive pushing you to upgrade to 10. They're also upgrading it's importance in Windows Update, & re-doing the pop-ups that used to be for reserving 10, though they hope you won't mind because they're making the ad copy in the pop-ups friendlier. To those who unknowingly downloaded 10's setup files over an expensive, capped, metered connection, the official word is Good News, Windows 10 understands metered connections, so once you upgrade that won't happen again!
I can actually see some point to *Some* of Microsoft's spin -- I don't necessarily agree with it, but I can understand how changing how you report financial data might help your stock prices. But some of it seems to me just amusing -- IF you were running a copy of Windows that was not legally licensed, & you upgraded to 10, they're making it much easier for you to visit the Windows Store to buy a legit license.