Hi there, I am very sorry to hear about your dx. I will say though that I had about 60% of my tongue removed and reconstructed, and it is not as bad as it sounds, if that is the path that they take you! it is a difficult journey, but i have relearned how to eat everything, and my speech is very good - some people cannot tell anything is wrong, others assume i have a retainer in my mouth. could be a lot worse!
Also, from what i understand it is sometimes hard to tell how much will need to be ressected until they actually get in there to do the surgery. the doctor prepared me for having about 30% removed with no reconstruction, and i awoke from surgery with 60% gone. on the contrary, someone else i talked to was prepared for at least 50% with reconstruction, but only ended up needing 30% removed with no reconstruction. i think it is hard to tell from scans until they get in there and start testing margins.
On a different note, do you mind me asking how you discovered the new tumor?
Good luck!