I think the other concept posted has one thing I like better - the little lines of colour - but apart from that, yes, this looks good (the other concept indeed looks like a sauber un-livery, though admittedly with more effort put in, but it has brings too many bad associations, even if those cars were interesting machines under the paint.)
Personally I have nothing against a black livery (esp. with well placed white accents) - the HAAS just wasn't very inspired or well done, and similar for the Relotus - time to ditch half-baked JPM livery throwbacks and go for something new. But Minardi had some great black liveries over the years, and that's part of the history of this team, so I could appreciate that.
That bit of (sidepod wing?) with the honeycomb on it looks promising (though I liked the yellow on the Renault that had it, hope they do it a bit better than that ended up).
The windtunnelly pic seems a straight reuse from last year actually (I recall speculating whether they were ditching the blue/red now Honda was in both Red Bull teams).
So, I guess apart from 'likely an evolved RB15 at the back' the car might retain some STR bits at the front - anything else we know?