J.J. Abrams and company have picked as their new villain the only villain who managed to kill Captain Kirk. The new villain is Soran. Look at the poster which features Cumberbatch wearing a trench coat which is what Soran wore in Generations. He is a character from canon that TOS crew never really dealt with. He has definite motives for revenge and he bares a very strong resemblance to Malcolm McDowell and he even sounds like him.
Two problems with your theory.
1. We already know the villain now, and it's not Soran.
2. You based your overwhelming evidence on the fact that both characters wear trenchcoats and have British accents. By that logic, he's also Shinzon.