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thank you for the information
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Couple of questions regarding this topic. &nbsp;Setup that I have is 4 nodes in Hyper-V. &nbsp;2 same location and the others in different datacenters. &nbsp;We use the systems databases for all logins. &nbsp;So will need to migrate them as well. &nbsp;<br />
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1. &nbsp;When doing an in-place upgrade on an AG what is the rollback? &nbsp;<br />
2. &nbsp;When manually failing over after the 3 secondary nodes are upgraded what happens? &nbsp;<br />
3. &nbsp;Does it failover instantly or does it take it offline and upgrade?
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Couple of questions regarding this topic.  Setup that I have is 4 nodes in Hyper-V.  2 same location and the others in different datacenters.  We use the systems databases for all logins.  So will need to migrate them as well.  

1.  When doing an in-place upgrade on an AG what is the rollback?  
2.  When manually failing over after the 3 secondary nodes are upgraded what happens?  
3.  Does it failover instantly or does it take it offline and upgrade?

SQL 2014 AG in-place upgrade to SQL 2016

Microsoft SQL Server is a suite of relational database management system (RDBMS) products providing multi-user database access functionality.SQL Server is available in multiple versions, typically identified by release year, and versions are subdivided into editions to distinguish between product functionality. Component services include integration (SSIS), reporting (SSRS), analysis (SSAS), data quality, master data, T-SQL and performance tuning.

Microsoft SQL Server

Databases are organized collections of data, most commonly accessed through management systems including schemas, tables, queries and processes that allow users to enter and manipulate the information or utilize it in other fashions, such as with web applications or for reporting purposes.