Will there be any issues upgrading one of my windows 2008 R2 servers to 2012 R2 within the same domain?

I am going to upgrade our current SQL and SharePoint servers from Server 2008 R2 to 2012 R2. The reason is that we are already running SharePoint 2013 on one server and SQL 2008 on the other and want to upgrade the SQL 2008 to SQL 2012 for the enhanced reporting capabilities. our company has OK'd a project to purchase some new servers after the first of the calendar year. It is at that time that I will be up grading the domain (AD servers) to 2012.
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Shaun HillCommented:
There should be no issue.  In place upgrades from 2008 R2 to 2012 R2 are supported.  As long as the software installed on the server is supported in 2012 R2 there should be no issue.
Comm_NavAuthor Commented:
So would I be correct in saying  that Microsoft supports the “co-mingling” of 2008 and 2012 servers as long as the DC’s are one or the other.
Walter CurtisSharePoint AEDCommented:
Keep in mind,

SharePoint 2013 without service pack one is not supported on Server 2012 R2.

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Walter CurtisSharePoint AEDCommented:
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