WorldCom's DWDM capabilities/OC12 SONET vs DWDM

Folks: in working on a project it has come to my attention that WorldCom doesn't seem to have a DWDM network to speak of, and reportedly has spotty DWDM coverage only in metro areas, a fact well hidden from company's marketing literature that seems to avoid talking about speeds above oc-3. Two questions -- can anyone verify/offer more insights/point to better resources on WorldCom's DWDM startegy? And -- as the rumor mill seems to suggest -- is it indeed true that despite obvious network economics SONET-based OC-12 and OC-48 circuits are indeed enjoying lower street prices than DWDM oc-12/48 circuits? Any thoughts as to why this info is indeed correct? Max