I'm not worried in the slightest. I've watched every TOS episode, read most of the books and seen all of the movies ... and I'm excited. I can't wait to see how this movie injects new life into Trek. To me, Trek is so much bigger than any "canon" change J.J. Abrams could make with this movie that I see no problems with anything I've seen or read thus far. Trek is the stories, the people, the wonder of exploring the unknown. It is literally the embodiment of everything humanity has thought since the first erect humans looked up at the stars and wondered what the heck they were and what was out there. I can't wait for this movie.
"The best diplomat I know is a fully-loaded phaser bank."