EPIC-Ms will continue to be made given that the parts and pieces are available. EPIC-M are not full featured... but have most of what you want.
EPIC-X Stage 2 will ship a few before NAB, production will continue after a slight delay due to Japan supply chain issues end of April. All features will not be available for early EPIC-X and upgrades will come as they are enabled.
All orders for Stage 2 and 3 will be shipped before summer's end 2011 (this year).
Order taken for EPIC-X at NAB will be shipped by summer's end.
EPIC-S will beging production as soon as EPIC-X orders are filled.
Hope this helps you with your planning...