I'd say a bit more than that. The Githyanki creche, at least 3 new companions, the Shadow-Cursed land the rest of the classes, and more subclasses/races are probably going to show up throughout EA
Were things like that mentioned in an interview or press release? Sounds great, but what gives you the thought that that's what they're aiming for later down the line?
A couple things.
For the three companions, they've been found through datamining, and it strongly suggests that they are currently in development.
As for the other stuff, it's places that are obviously blocked off/haven't been finished coding yet. You can see where the shadow-cursed lands are, but when you try to enter, it says "The region you're trying to reach is not *yet* available in Early Access", implying that it will be added later down the line. The Githyanki Creche is probably going to be added later as well, as there is data about it in Act 1, and Lae'zel's quest does not progress until you reach the Creche.
