NuWho -- Episode name : Utopua/The Sound of Drums/Last of the Time Lords. This is when we see Derek Jacobi regenerate into John Simm
Nobody apart from those who work on the show know for sure what will happen to 10, but seeing as The Master is returning he could have something to do with the regeneration.
He will regenerate into the 12th Doctor.
No. A timelord can regenerate 12 times, Matt Smith is only the 11th doctor. Also the master got around the whole 12 regenerations thing so I would hope that the doctor will too.
He'll regenerate into the 13th Doctor.
Time Lords get 12 regenerations, meaning 13 incarnations in total, though The Master has had more than this, by various means.
The fourth Doctor fell off a bridge.
Eventually yes, he will regenerate into the twelfth Doctor.
After the next two episodes then he will regenerate
Romana was another Time Lord, like the Doctor.
In the movie, The End Of Time.
Peter Davison.
No. He disappears into the time war portal with the Time Lords.