There has been lots of user interest in a 2.4 GHz AX chipset version of the 4000 series. In the 5 GHz version (the 4500) people are seeing shockingly good coverage through some trees, so the idea is that an AX product in 2.4 GHz would be significantly better than previous generations of 2.4 GHz gear. Better at throughput, and better at interference mitigation as well.
But, no word from Cambium.
If you want to search them up, there are 2.4 AX threads in these forums, plus a very active one with well over 100 positive comments on the Facebook WISP groups.