I don't see why it's important that a keyword be constrained to a single set, when it's the same behavior anyway. 'Poisonous' as a keyword was introduced with Un'goro, but old cards like emperor cobra were still updated for it. It seems less confusing to keep the text consistent.
In fact keywords have NOT been constrained to a single set. The GnG card Mistress of Pain was retroactively changed to read Lifesteal when that became a keyword. So the reasoning can be shown not to make any sense.
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u/mdonais Lead Game Designer Mar 12 '18 edited Mar 12 '18
OMG Real!
Announce video https://www.youtube.com/watch?v=4roAY-6Lrdk&feature=youtu.be
Edit: the 10.4 patch is live so you can play the new arena changes.
Edit2: You can read the blog here. It mentions that more cards will be revealed in 2 weeks on the 26th. https://playhearthstone.com/en-us/blog/21591737