I feel conflicted about it. They made it seem like it was going to be an epic death i.e. "Rick Grimes final episode", "Andrew Lincoln is leaving TWD" etc. Then they go and leave him alive. Then on TD, Gimple says, "This is the end of Rick Grimes on Walking Dead, but we will continue to tell Rick Grimes story on AMC original films."
So I guess he will not come back to the show, but they needed to keep him alive for the movies. Gimple said they will show different areas of the show, different situations Rick is involved in and we will see past and future characters through the years in these movies. He also said we will see different characters backstories too.
I'm guessing they will show us where the helicopter took him and what is going on, which seems like kind of a spin off, like another aspect of what is going on in the apocalypse.