Windows 10 Mobile Build 14393.571 could be the next cumulaive update for non-Insiders. However, the update is still testing and it will be released only if it passes the release criteria. Microsoft has compiled Mobile Build 14393.571 on 21th November and it could be the next cumulative update for Windows 10 Mobile.
It is worth mentioning that Windows 10 Mobile Build 14393.571 will only include various bug fixes and performance releated improvements. We should not expect any major changes from the upcoming cumulaitve update.
Which Windows Phone devices you own currently?