VDOT has a pretty good website on the project:
At the bottom of the page, under the "Resources" heading, is some very detailed of information regarding the need for, and benifits of, the project.
- Mini Roundabout Assessment
- Summary Report on Various Concepts
The newsletter cited in the original post is nothing more than the usual NIMBY whining. Especially offensive is the thought that Fairfax County should not make commuting and driving easier for people that live in Loudoun County. What's the difference between this line of thinking and Arlington County blocking the widening of I-66 or the extension of HOT lanes? Suppose Arlington and Alexandria did this on all the roads that cross the Fairfax County line??