I think we discussed this earlier, and perhaps buried somewhere in this thread, but I checked on my current bill, and I've got about $75 to go in terms of paying off my 6s; is this something that should be paid off before pre-ordering the X (and trading in the 6s)? Thanks for your input!
Update: talking with folks over at AT&T, it sounds like I'll end up with a monthly cost of just about the same, and probably $4 less than what I have now (6s, 64 GB) on the 30-month AT&T Next plan. The up-front cost of the X would be between $150--200 based on whether or not I turn in my 6s (to possibly pay off the rest of the phone). Checking gazelle, I could get up to $185 for it, but I wonder how much that will drop once the X comes out.