Microsoft's not using the "service pack" terminology any more, but Windows 10 has already had the equivalent of a service pack (the November update/1511) and is scheduled to get a second at some point this summer (currently in testing and called the Anniversary update).

They're also pushing out non-security bugfixes faster than they have in the past; the monthly Cumulative Update packages include security and non-security fixes, including some of the sort of hotfixes you might've had to call MS Support for back in the XP era.