MMO Champion has dug up more amazing stuff from the Wrath of the Lich King Beta in the form of new mounts! A full gallery of the mount models are up on their site, and they look very interesting. If you don't manage to get your own Amani War Bear before the expansion hits the shelves, it looks like you'll get another shot at an ursine transport in Northrend. Model previews show several versions of a polar bear mount, from what look like ordinary bears (60% speed increase) to armored bears (100% speed increase) to... double passenger armored bears! Don't ask about the goggles, though.
Are passenger-ready mounts usable anywhere? Or will they be zone-exclusive, similar to the bug mounts in Ahn'Qiraj? There's no way to tell just yet, but MMO Champion also has pictures of a three-passenger Alliance Wooly Mammoth. This means a Horde version is available, too, and likely to be part of a PvP scenario where the two factions have different mount skins. Speaking of PvP scenarios, there are also pictures of new siege vehicles as well as the previously seen Skeletal Gryphon Mount and an odd Blizzcon-tagged bear.