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With very few exceptions (like Orc sprinting), the racial passives have an almost negligible impact on gameplay. Any nerfs to them will largely go unnoticed while any buffs will probably be so small that they will not matter.
Stop overreacting, it's not gonna be anything big. Probably some minor nerfs or buffs to the same things we already have. There's always a chance the argonian potion racial will be redesigned because it is stupidly op, but i don't see any other major change happening.
"I don't know you, and I don't care to know you."
―Ulrich Leland, 3E 433
If ZOS was smart, they'd nerf the Redguards and Argonians racial passives and then they'd see quite a big increase with the purchases for the Race Change token.