My Asus DSL-AC68U has a G.INP (G.998.4)setting under "Administration - DSL Setting" so I think it will when we get the G.INP upgrade.
I am happy with my TD-W9980
Firmware Version:0.6.0 1.10 v0021.0 Build 141215 Rel.41342n
Hardware Version:TD-W9980 v1 00000000
System Up Time:40 day(s) 13:41:57
No faster connection than a HH5 but it never requires any attention.