Microsoft is developing the Azure PowerShell tools (and for that matter all of Azure) in an agile way – delivering frequent incremental changes and new features. Keeping up is, to say the least, non-trivial. One way to keep up with the PowerShell tools is to look at the ChangeLog.Txt file on the Azure SDK tools site on GitHub. That page lists, at a high level, the changes implemented in each new version of the tools.
As an indication of how fast Azure, and the PowerShell tools are evolving there has been over a dozen updates this year – roughly one a month, with some months more. That is a very fast pace of development.