I currently don't have status (later this month i will though...) but I had requested the upgrade supported by miles (15,000) on the day of booking.

I was also thinking that the 757 has 24 First class seats and the 767-300 has 26 C + 6 F= 32 Premium seats, so the equipment change adds 8 premium seats which should add to the chances of upgrade. This plane also has 7 fewer economy seats, so somone needs to move up anyways (looks like plane was F0/Y0 yesterday...)

I assume that the 6 First class seats on the 767-300 would go to paid F or
1K/GS folks only, so I have to illusion of getting one of them, but I guess I have a fair chance at one of the 26 business class seats...