I haven't seen anything on pricing, but I'm going to assume Toshiba wouldn't bring them to market in 2008 if they didn't have a plan to make them competitive.
As far as energy density goes - I'm not a math whiz and can't figure it out myself, but others have. It's not good. It appears that they will not be suitable for EVs, despite Toshiba's claims.
Still, at least Toshiba and Firefly are doing something. Which is more than I can say for most.