As I was installing the newly released tools, and catching up on updates for a new system, I ran into the following situation. When it came to going through the dialog screens to install the new tools, under Installation Type, it came down to two options. Perform a new installation of SQL Server 2012 was one, the other, Add features to an existing instance of SQL Server 2012. I decided to select to Add features (why? well, instinct I guess). And I went forward with that choice through the rest of options in the Setup dialog screen. However, when it came to the “Installation Configuration Rules”, I received a rule with a failed status.

And reading the text, it states “The CPU architecture of installation feature(s) is different than the instance specified. To continue, add features to this instance with the same architecture”.
What to do? What’s wrong here? Actually, nothing, really! No, there is one missed part, it should be installed as a new feature as it will not overwrite the previously installed tools, as those are specific to the VS2010 environment/shell.
So, the process really is to install it as a new feature (which was the default setting to begin with) I just figured “I would know better”.
All green now, installation completes and we are successful.