Etheral, Sinister, and Ulteran Prowlers are now available in the Marketplace for 2500 Station Cash each, the equivalent of $25 USD. So are they worth it? Well, that is entirely a matter of opinion, but we can help you decide with a rundown of what's available.
These huge felines offer a 65% run speed, and
They're available now, so check out the EverQuest II site for all the details.
[Update: Smokejumper has posted to the EQII forums to say that the mounts will be a "heirloom" item, which means the mount is bound across the account. They are not currently flagged as such, but SOE will be correcting that with Tuesday's update.]
[Update 2: Smokejumper has also gone on to say that the mounts do not have feather fall, as was stated in the online article. Thanks Conor!]