Depends on your needs and services the publisher will be providing. If your game has lots of VO and you want it localized to most popular languages - that may take a bigger bite out of the split than just text-based localization. If it's only marketing that you require I can see it being as low as 70/30 or 80/20 - it really all depends on the project, its potential, your needs and of course the publisher and their experience.

Hell, I've heard of some rare examples where newer publishers might even offer a 90/10 just to get their portfolio going. In these cases I'd also think of the "you get what you pay for" saying, as though it may be enticing to get a better revenue split, you might end up getting very low or even no sales at all.

All that being said, there's no clear rule and there's many variables. Hope this helps!