2K revealed on TikTok (lol I know, feels like the "How Do You Do, Fellow Kids?" meme) that they'll announce their new cover athletes next week, specifically on June 30, July 1 and July 2.
So three cover athletes total, I assume for main/US edition since they often run extra cover athletes in various countries.
They also say more info will be dropping during the week.
The video (mirror, not on TikTok): https://streamable.com/xpcv3y
EDIT 2020/06/30:
Current gen cover athlete is Damian Lillard

EDIT 2020/07/01:
Next-gen standard edition cover athlete is Zion Williamson, in an absolute shock to exactly nobody. But they did change colour scheme a bit.

EDIT 2020/07/02:
As many expected, Kobe is on the cover of "Mamba Forever Edition". For both gens.
Current gen:

Next gen:
