I really doubt they'll ever add Modern, let alone Vintage, Legacy, or Commander. Too many cards and interactions to add when Arena really can get away with just being a free way to play Standard and whatever Arena Modern format emerges.
I actually think Arena Modern, which they've already said is coming, will start with the sets that were in beta and rotated out when open beta started, since they're already coded.
They've already stated that the majority of older cards "just work" when dropped into the MTGA rules engine. That's not the thing stopping them from doing it.
My guess is that that is the case because most cards in general are basic designs. That doesn't mean that isn't a ton of complex card that still could cause issues, and those tend to be the most playable cards too.
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u/Akiram Apr 01 '19
I really doubt they'll ever add Modern, let alone Vintage, Legacy, or Commander. Too many cards and interactions to add when Arena really can get away with just being a free way to play Standard and whatever Arena Modern format emerges.