So! Good news amongst good news in the sets of interviews that are on the front page! Pathfinder is being divorced from Reputation, much like alot of other content that was gated by reputation.The team has also moved away from reputation being required to unlock flying. They want to have flying earned, likely in the next major content patch after launch, by completing the covenant campaign.
According to the interview quote above, it'll be unlocked via covenant campaign. The only way that I see it possibly being rep gated, is if they rep gate the Covenant Campaigns, but I've not been in the Beta, but I've not heard anything of the sort.
I for one, am glad for this. Reputation should primarily be for cosmetic stuff, I feel, such as tabards, toys, and mounts. Gating other things like flying, quests, and Allied Races behind them was frustrating, more so when they elongated this process even further by halving all the reputation you get as well.