Since nearly all ipads now in use have Retina screens, it seems to me that Sandisk must realize that many HD and Blu-Ray movies are larger than 4 GB. Why should not be able to use the full resolution of a retina screen? Nearly every review I have read of the Ixpand lists the file size limitation as a problem.
My guess is that adding this capability would lead to increased sales, for sure.
Philip Noguchi