I believe that was just how the event was billed, as a crossover between Bendis's "New Avengers" and the cast of "Astonishing X-Men," which was on hiatus at the time.
When Joss Whedon started up "Astonishing X-Men" again he only referred to the events of House of M/Decimation in one throwaway line, so while I may be remembering wrong I don't think there is any Astonishing X-Men material to include.