AT&T Release Date Speculation
The Z10 was officially released on February 5, 2013. T-Mobile became the first US carrier to offer the Z10, with it being available March 13th. AT&T followed soon after, making it available on March 22nd. Thus it became available in the U.S. approximately 5-7 weeks after the official launch.
I couldn't find data on the Q10, but the Z30 first became available in canada, on october 18, and became available in the US on November 14th, essentially 4 weeks later (though not on AT&T which seems to lag a bit).
Based on recent blackberry history, it seems likely that the passport will become officially available in the US (through AT&T) probably in the next 4-6 weeks. It seems unlikely that it will made available sooner than that.
I'm planning to get one when they're available, so I hope that I'm wrong and that they are out next week. But I'm guessing early to mid November before I get my early christmas present.