At least I can't seem to find technical specifications about this device easily (slightly hampered by using a mobile device), without those it's hard to tell.
1.2 GHz suggests that it shouldn't be the well known mt7621, mt7622 would be a more modern but still rather new (in terms of OpenWrt support) successor, but that's speculation without hard technical facts - and so would be guesstimating about OpenWrt support at this point.
Might be very similar to the TL-WDR7660. http://en.techinfodepot.shoutwiki.com/wiki/TP-LINK_TL-WDR7660
Note 4 MB flash size and 64 MB integral RAM in the TP1900BN chip. Could not see the numbers on the C80 flash chip.
Though it is 3x3 MIMO on both bands this is not going to be a high-performance platform.
TP1900BN and MT7626B(N) are different names for the same SOC, a single core (but two threads) ARM Cortex-A7 running at 1.2 GHz. It's still very new and as a whole not supported yet. What all known devices seem to have in common though, is the reliance on SOC internal flash/ RAM, which would limit it at 4 MB flash and 64 MB RAM - with those specs I see little (read, "no") chance of this getting supported.
https://openwrt.org/supported_devices/432_warning is a real problem - I don't see anyone wanting to put effort into supporting a new SOC, if all of its devices are below minimum system requirements and limited to that.