Maybe by home stretch he means a 20-minute version of Home.
Metropolis Pt. 3, called it
I don't doubt a Metropolis Pt. 3, there's quite a bit of evidence:
Death (of Mike Portnoy, metaphorically) is only a transition... Now is the time for regeneration.
re-generation as in Edward/Nicholas are reincarnated.
What better way to show off the actual skill of a drummer than to make a concept album?