The System Check tool now gathers a couple of new info when you update your Beta Opt-in Settings at the Battle.net account (login and follow this link).
I took a screenshot of the Beta Opt-in page and took another screenshot after I ran the System Check tool and submitted my new updated info.
Two new information is gathered by the System Check tool: Your Video Card Memory size, and the internet connection speed.
This Battle.net support screenshot doesn't display internet connection speed and the video card memory size. Thus, this might be a recent change.