The rules being what they are, at most six of the seven Dark Tower novels will progress from Round 1. That has to do with the pesky thing that is chronology, and Bracket #11 contains three DT books. The rules stipulate only two move on to the next round. So one will be left behind.
This is the place then for us to speculate which one: Wolves of the Calla, Song of Susannah, or The Dark Tower. Additionally, it's quite possible the other four DT novels may not progress further. There is a good chance The Gunslinger (Bracket #3) will go on. But there's good competition for The Waste Lands (Bracket #7), and I have trouble seeing The Drawing of the Three (Bracket #5), one of my most favorites of the series, moving on.