The best advice I could give is speak to HR, (very nice and helpfull people). If you can't get a definate answer there, then prepare for this stage, as if it was the old style second stage with the tech interview etc, so do as much prep work as possible. Any prep work done at this stage, will only be of use later on in your application, so it won't be done in vein.
Hope this helps, Ian Dickson.