I think they do have a skeleton of a plan for further Classic releases at present. (TBC, Wrath, etc) but they haven’t committed to them yet.
I think Classic+(or variants thereof) is something that may be getting discussed, but no decisions have been made, and those discussions have likely “punted” the time for making such a decision to some point further down the road. Such as after they establish whether or not “Classic has legs” to stand upon.
Throw in the whole legal angle involving abandon ware on top of it, and somebody Specifically asking about plans for “Adding new content to Classic” and you just the door wide open for Ion to reply “Absolutely not.”
Because Classic is intended to be a museum piece. That isn’t to say they can’t create a fork that branches away from it. It just won’t be under the Classic Label. Ion gets to be 100% truthful multiple ways. Classic isn’t getting new content. So “Absolutely not” is correct.
Also, they haven’t made a decision as to whether or not it is “worth their time” to create such a “fork in the road” for that kind of content, so no plans exist at present except for the intention to evaluate things later. So once again “Absolutely not” is a demonstrably valid response for him to give at the time the interview was given.
It doesn’t mean he ruled out the possibility of such a thing happening in the future. He was simply making clear such a thing was not happening right now.