So, upgrade is pretty easy this time around.I will have instructions soon. But you can basically use "standard" upgrade steps. I recommend emerge -1 glibc gcc first, then emerge -auDN @world should generally work. Report any bugs related to upgrade like failed builds because often this can be fixed by tweaking dependencies. Overall the upgrade is MUCH easier than 1.2 -> 1.3.
One trick is to remember to "eselect python set --python3 python3.7" after python-3.7 is emerged to make it default. Also, mesa right now is very picky about USE flags related to video card. For example, if you don't have a card that supports vulkan, you cannot have vulkan in USE. Same with xa and other things that were more "permissible" before.
As of yesterday, I am now happily running gnome 3.32 and it is working perfectly. I would still call things "in beta" but the remaining issues (there is a "reboot doesn't work" issue currently active, due to a missing /run/initctl -> /dev/initctl symlink) should be worked out with minor package updates.