S.,
My family and I just moved from Florida to Connecticut last year. I have to say that I'm very surprised people are saying it's not as hospitable here. I have found it to be just the opposite! I lived in Florida for six years and I never felt at home or found people to be very welcoming. Coming to Connecticut has truly been a breath of fresh air! I already have more friends here than I ever did there. The same is true for my son. He is also 14 and started high school this year. He has a little bit of an advantage over your guy because he was able to meet some kids and make some friends in his last year of middle school and they've now moved up to the high school together.
I was so worried for him when we first moved here though. Like your son, mine is also a straight A student. He's not a "cool kid", meaning that he's just very well behaved, not into sports, is much more interested in "geeky" things (chess, computers, science, etc.) and is on an IEP so is in a "special class" (Study skills, but still a "special class." I cringe at this because I know how cruel kids were when I was in school).
Is your son into any sports? Does he play an instrument? Does he have any hobbies or interests that you could look into finding an activity for? My son plays the saxophone. He wanted to quit playing last year when we moved here, but I made him stick with it. I wanted him to get into a class that fosters something of a social environment with kids who share something in common with him. It worked quite well and he made several friends that way. Also, he joined DeMolay last year. It is a young men's group (ages 12 to 21) and they get together and do all sorts of social activities and have many events. So far there has been a dance (with the sister girls' group), they have played laser tag, they marched in the Memorial Day parade, they went on a three day conclave, there are monthly meetings and afterwards they go and play pool, shoot darts, play cards, play video games, etc. He has made many friends this way and now sees these same kids walking down the hallways at school and in the cafeteria and has people to talk to and sit with. I love what DeMolay has done for my son socially because normally he's such a shy, reserved guy who has a hard time making friends, but he's just thriving since we moved here! Maybe you can check out the DeMolay in your area. This is the national DeMolay site: http://www.demolay.org/whatis/ And here is the CT DeMolay site: http://www.ctdemolay.net/index.shtml I have found that the other boys who are part of this organization are very much like my son: polite, well behaved, good students, intelligent, etc. The kinds of kids you HOPE your kids will become friends with!
If that doesn't sound like his thing, I'd contact the school (my son's guidance counselor was SO helpful in this area) and see what kinds of clubs (sports, academic, hobbyist, etc) are available and maybe there will be something he'll be interested in. I really think that's a great way to meet kids who you'll have something in common with and who you can socialize with. All he needs is ONE friend and that friend will start introducing him to more and more people and, before you know it, he'll have more friends than you can count.
I wish you and your son the very best of luck. I know how hard it is to be the "new kid" at school both because of what I've seen my son go through each time we've moved and because I was moved to a new school when I was a junior in high school. It's not easy at first, but given a little time, things work out. :)