"The Propensity to Cycle Tool (PCT) is an open source web tool which allows urban planners to visualize and estimate cycling potential across England. This makes it far easier to plan residential cycling services such as hiring, parking and routes. It does this by accessing which current motorised transport trips could be easily switched to cycling, based on distance and hilliness."
(Link Removed - No Longer Exists)
From what I got from the video and a few other articles is that it helps city planners see where cycle lanes can be easily added to current infrastructure. Hopefully this means not just more cycle lanes, but more useful cycle lanes based on popular routes and help reduce congestion.