Cortex M3 to M4F Transition and Availability

Back to work January 2, 2013 and, surprise, all the Stellaris M3 parts have "vanished" from the selection guides.  Going to the individual part number pages show them as NRND.  In their place are the M4F parts but they don't seem to exist either.  There are no parts, even as "Preview", with Ethernet and external memory and for the others, distributors have no stock.  One distributor shows 7 parts - all but one are "obsolete" and that one has no stock and no lead time listed.  Another distributor shows 6 part numbers with no stock and no lead times (except for one part at 999 weeks!).  A third has 102 part numbers, all but one have no price (non-cancelable, non-returnable) and that one lone part has no stock and no lead time.  Can someone please provide some real availability, life-cycle information and road-map for the Stellaris LM4F line?  I hope these parts aren't a marketing "flash in the pan".