After talking with BW Phoenix folks...

As I understand it, only AA and aeroplan are participating partners in the Fall Promo.

For AA, your mileage stays will look like this: 250, 750 (250+500), 250, 750 and the like thereafter, unlimited (unlike the limitation placed on point stays). One rep said the second, fourth, sixth, etc. stays would be 1000 (250+750).

For point stays, it's base + 1x for the Double, and base + 2x for the Triple, on Stays #2 and #4.

>>>I was informed that the Fall Promo terms are subject to change, since it hasn't started yet.

I'm only going for the four stays with points, stay #1 and #3 one night each, stay #2 and #4 two nights each. These stays were already planned for, but I switched some bookings around in order to max out the points. While I'm keeping an eye out on other hotel chain promos, some of my BW stays are relatively fixed due to the lack of other offerings for the locales I'll be visiting.