Toshiba held a press conference, one day before CES 2012 opens, and they unveiled the OLED tablet they already said they'll show. It seems that the tablet is a "reference design" - so it's not a finished product yet. And the OLED panel is 7.7".
According to the report, the OLED does not use PenTile. It's probably the same Super AMOLED Plus panel that Samsung uses in their own Galaxy 7.7 Tab. Hopefully we'll hear more from Toshiba soon - including when and where they plan to release this tablet.