I currently have OPi lite2 and I think it would be great to add support for lite2, too.
Agreed, but I don't have it. In this case it's not as easy as adding entry in uboot_helper script, because kernel and U-Boot DT need to be updated and maybe something else too. PRs are welcome, though.
bluetooth which probably hasn't been solved for any board.
Why not? It works on several boards (those which have Broadcom module). Currently I can't rememeber status on OrangePi 3 and I can't test ATM, but I think it works there too.
WiFi(I guess related to vcc)
Note that official OrangePi site reports that different wifi modules are used for OrangePi 3 and OrangePi Lite 2 (AP6256 vs. AP6255). If DT node is set correctly, there still may be difference in firmware. If that is so, you should see an error in dmesg - driver complaining about not able to find and load firmware. But that is relatively easy to fix, just provide dmesg output and I'll take a look.