This thread tracks updates to Revit 2016. If you want to follow along check you are logged in, look right, click on Thread Tools and subscribe as shown below:
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You should be offered updates by the Autodesk desktop app. If you're not using that program you should look into it.
As I write this the most recent update to all Revit / Revit Architecture 2016 is Service Pack 2. For subscription customers it's 2016.1.9. Also check the end of this thread for breaking news.
https://knowledge.autodesk.com/suppo...t-updates.html
Unless Autodesk changes the address you should be able to see the most current Revit updates at their Revit 2016 Product Updates page. There you can also read the release notes.
Subscrition updates are listed first, with service packs listed further down.
If you need to know what your current build (version) is, take a look at How to tie the Build number with the Revit update (thanks dkoch)