No roadmap, AFAIK. Actually, ironically, heh, that’s another feature request.
I’m hopeful that its #1 vote rank (140 votes as of Jan 17, 2019) means it’s more likely to be added. I am a Free user (thank you, BW development team, for this amazing password manager, BTW; came from LastPass last week), so I’m not particularly antsy: but it would make me feel much safer once it finally comes.
And, yes: I think most current LastPass users wanting to migrate would be held back by primarily this feature (and perhaps text field account selection).