I've been picking up on it for a few days now.
Really it's Microsoft trying to out Apple, Apple. Now that I have a Surface as a work machine (no desktop, just a surface with wireless mouse and keyboard added), I can confirm that it is one of the best portable machines I've ever used. So MS get's kudos for that.
Their Surface laptop is now a good spec with a "claimed" 16 hour battery life. But, again, you're going to have to spend £1,300 to £2,200 to get the spec I want. Not so bad though I spent the better part of £4000 or more on my Alienware.
Their new Surface Studio is interesting, especially in how thin and pretty it is, but at around £3,000 it's really in the business range, not home.
As for the surface dial, a thing like a hockey puck which you can use on existing surface laptops, beside it, to control tools and other things by turning or pressing it, or you can actually place it on the Surface Studio screen and control the app directly from there.
I'd say Gimmick but, in reality, it is like all those excel equations. If you need them (8% of the user base), nothing else will do; however if you don't then they're totally wasted space.
The two most interesting announcements received the least press. The OS and design tools (including Paint), have received 3D design extensions to allow you to model in 3d. The presented possibility was that you could take a photo of something, model it in 3d in the tools then print it out again on a 3D printer.
The second announcement was that the hardware vendors will be shipping relatively cheap (£250 - £300), 3D headsets for the new "Designer" update of Windows. Put this together with gesture based controls and the ability to photo and model things you have just seen, means you could see something, take several photographs of it, import it, put on your 3D headset and walk around it and re-model it all inside the headset with gesture tools and controls (curtesy of the Hololens suite), then 3D print your new item.
That last bit has some pretty dramatic connotations for the design and manufacturing world or even for the home ad-hoc projects.
The headline launch may have been a bit underwhelming, but the potential it unleashes is quite dramatic.