I don't think they will ever update appearance on weekly/monthly basis because they just don't care, it's possible and easy to do yet it's neglected because it's not their priority. It's silly to ask update for players when you have bunch of generic faces in first place, start from rookies Hilliard, Harrison, Marjanovic, that Raptors rookie (Montero i guess). If you are looking for authentic looking game i recommend you PC version, we got everything there from new faces/haircuts/tattoos to arenas, lightning, custom sounds, new classic teams..it's basically new game and much better one IMO.
To make you little preview..here is how Rose looks now on PC
