There's a couple problems with this news report. First, iriver aren't exhibiting at CES 2011. If they had this new ereader, don't you think they'd be there in person? LG will be there, though, and I couldn't get a definite statement out of the pr rep.
My other problem is that so far as I know LG Display don't have a 6" screen with that resolution. It wasn't in their booth at SID Display week back in May. They did have a 6" screen, yes, but the resolution was 800x600.
But consider the screen resolution. This new screen has about 223 pixels per inch. The current 5" E-ink screen is 200 pp, so the new screen is only a marginal increase pixel density. That stated resolution could indeed be correct. Let's see what happens next week at the press conference.