Well, does anyone know how many albums their contract with Roadrunner lasts? I think they have at LEAST one more studio album after Clockwork Angels, just to give us a rounded out 4-album run of VT/S&A/CA/"20". I think 20 albums would be a rounded number, and if they take another 5 years to release another studio album, then their 20th album would come out in 2017, just in time for their 50th Anniversary in 2018 - The Fifty-Year Final Farewell Finale Tour.
-Marc.