In web, the "upcoming events" view supports receiving a "time" parameter to determine when it should start getting events. This param doesn't seem to be used by the UI right now, but it's there. However, the core_calendar_get_calendar_upcoming_view WS doesn't support this parameter.
This means that web could easily create a "Load more" button or something similar, but the app cannot. IMO we should support this param, even if it isn't used right now.