Jerry - I know its after the beta cutoff but came across a couple minor items...
I wound up replacing the HDD (with a SSD

) in the mini.. So 32-bit OS and 1200x600 resolution..
In GIMP the "maximize" arrows doen't change the window size... However minimize works.
At the resolution above - the window height extends the beyond, the bottom of the screen and cannot be adjusted in the corners...
Some application window sizes can be only be adjusted by the upper corners (think this was mentioned), some examples... Firefox and power manager only top - Image Viewer both top and lower right corner.
Waking from hibernate (power manager) on occasion the mouse icon(pointer) will not restore, if moved items will highlight and can can be used - just cannot visually see the pointer -- this has only be a couple times... And on a limited install...
This setup uses 2 wifi adapters, 1 internal 1 usb, and this maybe driver but in 2.8 Network Manager would display and connect individually (I could connect/disconnect each adapter) in 3.0 its more combined under a single..
Another note..
guvcview - webcam seems to working on the newer kernel
Just posting as an fyi, nothing is show stopper ...