I'm glad to see the incorporation of "Hovering at Death's Door" into the official options. We've been using the AD&D (1e) version for our OSE game.
I'm thinking the Barbarian adjustments will be to HD, and possibly a version of the 1e UA Barbarian being able to use certain categories of magical items as they level up.
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Obviously, there would need to be some adjustments, but as it currently stands, magic items are one of the few ways B/X characters can distinguish themselves or gain new "options." So the current OSE Barbarian is at a bit of a loss.
I have to assume that they're tinkering with the Assassin's instant-kill ability, but I don't know how they'll adjust it. I'm also a little unclear as to what they'd do with the Ranger.
Any speculation?