Early reports from people who got the V710 already (RadioShak has it) say that its bluetooth is missing certain profiles, and can only sync with Mot's software, which isn't availble for OS X. I'm not clear on whether they actually tried and failed to use iSync, or just believed Motorola that they had to use their software. Here's on example:
Gizmodo
I'll be curious to hear whether it is in fact possible to iSync this phone. Perhaps if its missing now, they will update it once iTunes is ready.