Quote from CBS Foursquare: 'teams must choose whether to sabotage their fellow Racers for a chance @ 1st place!'
I find this worded a bit strangely. I wouldn't say that using the U-Turn gives you a 'chance' at first place. If you're already in first, it just makes first place more likely than it already is, and if you're second or below, it doesn't get you any closer to the team in first.
What if the inclusion of the iPads heralds a new way of U-Turning? There could be two U-Turn boards, both a long way apart, and a team would use the power at the first board, but wouldn't discover their fate until reaching the second. In this way, a team would be able to U-Turn a team that is in front of them.
I don't really think this is the case, but it would be a very interesting idea if it was implemented correctly!