Hi guys, maybe Mikrotik staff like @Normis can answer this. Will the new Ax series allow outdoor nv2 protocol? If no, will Mikrotik support this protocol in the future?

I don't think 802.11ax is made for WISP usage. Am I wrong?

Currently nv2 is listed as one of the lost features of the new wifiwave2 drivers, so I'm afraid the answer is probably no.
Worse, station-bridge mode is incompatible between old wireless and new wifiwave2 drivers, so can't mix old and new devices in one wireless network.
Plain 802.11ax (if you build a new network with only AX devices) might not be that bad for WISP usage though, time will tell.
Would be nice to know the superchannel frequency range possible with the new chipsets - it's not yet wifi6e but it would be nice to be able to use some of the licensed 5.9-6.4GHz band I have available (my license expires in 2029 and by then the band will probably be free to use for everyone, right now using aging Cambium ePMP1000 gear which is only 802.11n with their own proprietary TDMA and GPS sync).

That is a bad new. So there is no possibility to sync AP without additionnal protolcol. 802.11be woluld be a better path for mikrotik if they count on 802.11 protocole only. Wifi7 has built-in gps timing feature.

The only purpose of this ax serie is probably campground and festival to beam on wifi devices.