The Cosmic Avenger is back with his fellow Assemblers!
At least on the variant cover to Avengers #18, an official Infinity tie-in.
Marvel released preview pages where we see Quasar on the Daniel Acuna cover.
As the event is cosmic and dubbed "Infinity," it makes sense for the Protector of the Universe to appear.
Previously Tom Brevoort remarked that there had been talk about using Quasar.
Jonathan Hickman, don't fail us now (gulp)!
Issue hits August 21st.
Update: Cover is a 50th Anniversary variant, which may mean it's just for the anniversary. Attempting to find out more.