it's "official" from IRex. (link found in the irex-forum)
"*Adobe PDF and EPUB support will be available via firmware update for all owners of a DR1000S (End Q1 2010)." to be found in the middle of the page.
It would be nice to hear a more official statement from Irex about the delay.
It's a shame, what they do with their customers. Would they could do wrong - they will do it.