Ok, What I think about the XF2 demo.
First of all I'm really but I mean Really, did I say Really? happy to see utf8mb4 support
This had to be done in 2.o otherwise it would have been to complicated.
Retina support
However I might try to use svg, I'll see how it goes
Navigation manager and widget system
Nice and easy
Custom user / thread fields
Great!
Extended external/connected accounts framework
New HTML5 uploader
Finally!
New editor
Off canvas navigation
New share page system: new sites, less overhead
I always like less overhead
NoCAPTCHA
Must have
Drag and drop sorting of node lists and other content types
Nice!
Responsive media embeds
There are other things I like too like the New generic payment framework for example, but I'm not using it a.t.m.
Further I like the look of XF2 on my mobile, but not so on desktop. The UI from XF 1.5 looks more clean / neat on desktop.
I understand this is the first preview so I hope there will be some fine tuning here and there.
I always used the default style in XF 1.x because I liked it.
Not sure what I like to change tho
Edit: now I know!
Without those the page looks nice and clean.
A few styling changes around the navigation will probably do the trick.
At least the system is very flexible and easy to customise , just have to upgrade my brain again to learn the new stuff.
Congrats XF team
Well done so far!