I'd assume it's the old DS since they don't mention DS lite anywhere in the contract/terms and condition except shown for the picture which is a bit misleading.
And from their terms:
THE PROMOTIONAL PERIOD, COMCAST’S REGULAR CHARGES APPLY UNLESS SERVICE IS CANCELLED. YOU MAY CANCEL SERVICE BY CALLING 1-800-COMCAST
So I assume you can cancel, but it might be a small hassle?
I didn't sign up for this or anything, just from reading and my own assumptions.