I'm personally looking out for v20 now. Given the progress Cliff has made, I'm setting a new high bar. I think v20 will be for people like me who don't have true "accomplished musician" talent. Essentially, you will just add a block called "Talent" and bingo!, your playing like EVH.
Oh, and of course there will be lots of parameters under the new TALENT block:
TYPE: Rock, Pop, Jazz, Heavy Metal, etc. (now the Rock expert can play Jazz instantly)
SPEED: Slow, Medium, Fast, Super Fast, Blazingly Fast, Can't See What You're Playing Fast
SCALES: Major, Minor, All, etc.
FEEL: Soft, Medium, Hard - of course this is tied to an expression control parameter to be varied
ARTISTRY: Beginner, Intermediate, Expert, True Artist, etc...