No reason they shouldn't be "Avengers family" books, imo, considering all of their ties to Avengers.
A-Force will not be the characters from Battle World.
What ties do they have? Besides Hyperion, none of the others were ever members and besides Spectrum, even met them. But they do seem like they might be going after Namor and perhaps the other former members of the Illuminati and perhaps the Cabal?
It would be interesting to see what Steve Rogers view is on them going after Namor and is he still upset over the mind wipe?