You could assume that one of the next patches will include new Jobs. Like stated earlier, he could not give informations out yet, or he would not have much left to announce at E3. That implies that they will talk about new classes, shiva is also everywhere and you could assume it is coming along with a new Area, since Giga's dont really have a "Stronghold" yet.

It also states on the card "Classes", not one but more than one. From 1.0 to 2.0 there was ONE new Class, so you could also assume it is refering to the current state/upcoming patches, since "Classes" does not fit 1.0, or 2.0 Release.

Tomorrow is the first show and there will be a couple more. I would guess the best is saved for the later second Part of the Live Letter and also for the last show. They probably will hint about it tomorrow and get more into it over the next Days.