Warren, nationally known (no Tim Kaine), brings Bernie's progressives and progressive policies, like rebuilding her CFPB.
I would expect she will get a lot progressive stuff into the platform, like
$15 minimum wage indexed to inflation,
killing forced arbitration,
DACA permanent with short path to citizenship,
uncapping Social Security,
expanding Social Security
financial transaction tax
raising capital gains tax,
killing carried interest
blacks are gonna vote Dem anyway, so an unknown black veep brings nothing