The Revit Clinic posted notice of updates available for Revit a few days ago. You should get a pop up from the Autodesk Application Manager, but if not, check it out in your windows notification bar (near the clock).
Revit 2015 Update Release 13 and Revit 2016 R2 Update 3 have both been released.
Just a reminder that any updates with 'R2' is referring to a subscription only update, & includes student licences.
As we pass the half way point of March we are also coming up to the release of Revit 2017!