Thank you all for your valuable inputs. I just got back after meeting up and further evaluation with my plastic surgeon and the Onco surgeon. I have been asked to get ready for the surgery next week on the 19th. It is going to be a 6 hour surgery and from what i understand, they will address the following issues:
1. Freeing and mobilizing the tongue
2. Widening and bettering of the mouth opening
3. Address issues relating to Jaw stiffness

The doctor mentioned that they will prefer to do the lower teeth implants at a later date and not combine it with this surgery. However one small disappointment was the doctor was not very confident of achieving better lip sealing but did assure me that it will not matter much once the tongue is mobilized. Keeping my fingers crossed and praying for the best.
Chandra