Vieira herself has said she wouldn't rule out the possibility of jumping to the "Today" show if Couric decides to leave NBC for a CBS anchor slot.
There's nothing official, of course, and while the Philadelphia Inquirer reported Monday that NBC execs have had "several" meetings with Vieira, insiders say the Vieira-to-"Today" scenario is remote, at this point.
Vieira, for starters, has never coveted a morning-show gig, which requires brutal hours. As a working mom, she has a convenient schedule as co-host of "The View" (which airs live at 11 a.m.) and as the host of "Who Wants to Be a Millionaire."
Vieira's contract on "The View" expires this summer, while her "Millionaire" contract has two more years to go, according to the Inquirer story.
Couric's deal with NBC prevents her from negotiating with CBS until May, although it is believed that discussions are under way with NBC officials to allow her to at least field an offer from the rival network sooner.
NBC brass is said already to have a plan in place and ready to go if Couric departs. The network has reportedly offered Couric around $20 million a year to stay, but is waiting for her decision -- which, sources say, she won't make until she is allowed officially to hold talks with CBS.