next already has several F3 boards in it.
drwxr-xr-x 4 cliff cliff 4096 Dec 5 2017
ccf3ddrwxr-xr-x 4 cliff cliff 4096 Dec 5 2017 coptercontrol
drwxr-xr-x 4 cliff cliff 4096 Dec 5 2017 discoveryf4bare
drwxr-xr-x 4 cliff cliff 4096 Dec 5 2017 gpsplatinum
drwxr-xr-x 4 cliff cliff 4096 Dec 5 2017
nucleof303redrwxr-xr-x 4 cliff cliff 4096 Dec 5 2017 oplinkmini
drwxr-xr-x 4 cliff cliff 4096 Dec 5 2017 osd
drwxr-xr-x 4 cliff cliff 4096 Dec 5 2017
pikoblxdrwxr-xr-x 4 cliff cliff 4096 Oct 16 2018 revolution
drwxr-xr-x 4 cliff cliff 4096 Dec 5 2017 revonano
drwxr-xr-x 4 cliff cliff 4096 Dec 5 2017 revoproto
drwxr-xr-x 3 cliff cliff 4096 Oct 24 2017 simposix
drwxr-xr-x 4 cliff cliff 4096 Oct 16 2018 sparky2
drwxr-xr-x 4 cliff cliff 4096 Dec 5 2017
spracingf3drwxr-xr-x 4 cliff cliff 4096 Dec 5 2017
spracingf3evodrwxr-xr-x 4 cliff cliff 4096 Dec 5 2017
tinyfishand the aforementioned dev branch has Omnibus F4 in it.
That's all we currently have. I am not very up to date about what is being worked on. @F5soh might know more if he comes around and comments.