This is from Auntymoo in the comments section:
Announcement was made today at 1pm. Norman Spirit to run out of Ramsgate and to be renamed Ostend Spirit. LD Lines in partnership with TEF, service to start approx 15th March !!! Whats next ? perhaps a fast craft to Boulogne or Ostend ???? ? Auntymoo 8th Feb 2010 @ 2:29 pm
This has also been corroborated by and also by the Thanet Extra.
So Ramsgate does get a new passenger ferry, but not to Boulogne. I somehow have more confidence with this than with you know who. There will be two return crossings a day which will be 4 hours each way, and single tickets will cost £24 for a car and five passengers.