http://www.dover.gov.uk/pdf/Park%20and%20Ride_BRT%20Text.pdf
Quickly scanned through this, there's a map of the proposed route (page 7/8), it appears to go through open farm land near B&Q, parallel to the A2 and then joins the road from Guston before going down Castle Hill.
It also suggests things like bus lanes down Folkestone Road.
Of course, all these new residents of Whitfield will just probably drive to Tesco, Canterbury or Westwood Cross.