You may already know the answer now, but it's recently been (almost) confirmed that Humans get the floating +2 +1 that everyone else gets, while also getting proficiency in light armor and polearms, along with a +20 lb carrying capacity.
There has been a fairly loud outcry, however, so this may change.
There are more voices datamined and I believe I heard one of the attendees of the last Panel from Hell to say there are two further choices for voices in the full game. I have consumed so much BG3 media in the last month that I won't be able to find that, though, so take that as a 'maybe.'
(Was it Wolfheart? It might have been Wolfheart...)
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