If we're talking about Android, it's my understanding that nothing has changed from before. sections=0 is a page view. sections=all is not because it's used for saved pages updates.

If we're talking about iOS, as of right now, both sections=all or sections=0 are page views. Neither kind of query is used for anything else, because saved pages updates are not in production.

Our next release for iOS, targeted for 30th March, will include a saved pages update feature. I'm unsure of the structure of the query used to refresh saved pages. The iOS tech lead, Adam, should be able to shed light on this.

Dan