Hey folks - Spring 2015 Air Force OYCP selectee here, figured now that I'm on the accessions end of things I'd provide some updates on things I had questions about a year ago. I have zero knowledge of how things work for people going through DAP, so none of the below applies to that program.
1) FTAP pay - my year (field training summer 2015) did in fact get paid for FTAP. However, it wasn't until April or May of 2016, so definitely don't make any time-sensitive financial plans involving FTAP pay. Also note that for us, field training was 27 days long - it was shortened this past summer, and there's no way of knowing how long it will be in the future. The point is, if your field training + FTAP experience is shorter than 28 days, you might not get paid. Maybe someone who went this past summer can speak to that.
2) Post-bar timeline - If you came through the GLP or OYCP programs, don't expect to be on active duty the second you get your bar results. You should make sure you have a plan to pay your bills and such for most of the remainder of the year if necessary. Several of us took the bar in states that deliver fast results, so just be aware, getting results early doesn't necessarily mean getting paid early.
3) Base selection - you do in fact get to fill out a new base selection sheet, so don't worry, you're not married to the terrible choices you regret submitting with your application.
Obviously all of the above could change in the future, but its how things worked for us 2016 grads.