Blizzard Employee here. Here’s what I got to tell ya’ll:
Due to the overwhelming success of Classic, we will be stopping all updates on BfA and focusing our efforts on the majority, since it rakes us in more money.
BfA will continue for what it is, but do not expect future updates. It is a waste, and money hole on our part, and we will not make that mistake again. The retail player base won’t buy our store mounts. 
As for Classic, after we finish all phases, we will introduce new content through patches. Never-before seen content, tailored specifically just for the classic player base. It’s a few years out, mostly in the development phase. Basically, it’s an alternate timeline involving the Bronze Dragonflight, and quite a few things will happen that I’m sure the players will love!
Such exciting things coming down the pipeline! 
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