^A "roll", singular, is typically where the track goes from standard position to upside down while traveling in a fairly straight line. Barrel rolls are like this: http://rcdb.com/1412.htm?p=6546
and zero-g rolls are like this: http://rcdb.com/80.htm?p=1320
Cobra rolls kind of break the terminology there... but what are you going to do, we're bad at keeping standards
It sounds like this supposed roll in the valley is a zero-g roll, but I'll hold my breath until the announcement or photos are posted. With all the surprises this coaster has thrown, who knows what's really been spotted or what the track is actually going to do.