Additional info at MSNBC...
from Alan Boyle. It should be a hell of a flight. According to the article, this flight will be the first one with the full duration (80 seconds) engine and without the ballast to represent the two passengers. Due to the lighter weight, it wouldn't surprise me if it tops 70-75 miles altitude. If fact, if it "only" reaches 100 kilometers altitude, the program might be in trouble because it would fall short with the ballast.