The release on Steam includes both the Elder Scrolls Online Standard Edition and the Imperial Edition which are currently a part of the Steam Quakecon 2014 deal and priced at €27,49 and €47,99, respectively.
Of course, you will still need the Elder Scrolls Online account for the play but the purchase does include 30 days unlimited game play, so it does not sound like a bad deal. The Steam Quakecon 2014 Weekend deal will end on 21st of July.
The Elder Scrolls Online was released on April 4 and is expected to be available on the PlayStation 4 and the Xbox One as well at some point in future. You can check out more over at Steam via link below.