Those of you interested in AT&T should check out this monster 169 page presentation (warning, .pdf link) made yesterday at their analyst conference.
The specifics on Project Lightspeed can be found on pages 86 – 113.
I have a hard time buying the reductions in opex. The reality is AT&T is going to have MORE, not less hardware in the field that can break. This is where the FiOS all optical approach really shines ( ha ha -rimshot-).