Well, I just saw the trailer in front of the Bond flick today. I have to admit, I'm a little baffled by what I've seen so far. The writer in me wonders why they chose to put young Kirk on a motorcyle instead of on horseback? That was a missed opportunity to draw a strong contrast between Jim Kirk's farm-boy origins and the futuristic construction of the 1701. It would have been a far more compelling scene, anyway. Plus, Kirk is a cowboy in spirit, right? It was so right seeing Shatner on a horse in the Nexus...
Of course, Kirk leaving an idealized existence in the Nexus is the only time Kirk was seen on a horse or even talked about a horse. Horses were Picard's cup of tea, not Kirk (until TNG writers decided he was).
Besides, you want him to ride a horse all the way to San Francisco from Iowa?
Well, actually I didn't get the impression that he had been riding a bike from Iowa to San Francisco in that clip--or that the scene with the shipyard was in San Francisco. It looked like in the middle of a desert, but the trailer was so fast paced I'm not sure, honestly.
I had no idea Picard liked horses. That seems incredibly out of character?
As a fan of TOS, I just assumed that since Kirk grew up in Iowa, that he would be very familiar with horses--plus his idea of heaven (the nexus)clearly showed us his roots were in the country, and horses played a huge part of that. All of that has been established in canon, and is not some obscure reference in an old episode, but a significant scene in Generations.