It was the first question in the Q&A. The Red Shirt Guy asked about it.
Q: From Red Shirt Guy! Any changes to heritage armor acquisition?
A: Still have to get to max level, level 60 with the squish.
Watcher didn’t give any more information than that in Shadowlands reveal, the Deep Dive or the Q&A.
After the level squish, all races and classes start at level one, even DKs and DHs. Allied races start at level 10.
Edit:
WIth the release of Alpha, DKs and DHs now start at level eight (8) and play through their own starting experience. No more restrictions on number of DH created per server.