The problem with the proposed design of the bypass and how it transitions into the existing 28 at the north end is that it can't be easily upgraded to a freeway down the line, despite the existing Godwin Drive and VA 28 north of Manassas being potentially upgradeable limited-access at-grade expressways, and the proposed bypass section looking to be the same.
I also hope they have a project in the works to realign 28 at the VA 234/Prince William Parkway interchange to feed directly into Godwin Drive. This isn't included in the bypass project from what I can tell, though it seems like it would be fairly easy to do.
Not really sure what you mean on the first part. Though I would agree about the Godwin intersection, especially as the baseball complex is rumored to be redeveloped there can be more space for ramps and whatnot.
^Exactly and I suspect those intersections (lights) along the bypass will become an immediate problem/annoyance (as they currently are on the VA-234 portion of the PW Pkwy). Thus VDOT will probably have to conduct an additional STARS study resulting in more costs whether that be small improvements or interchanges.
That hopefully not, I heard the tie-in in Fairfax has come under ire as it will be a plain 3-way intersection.
I do have a thing to note concerning the Ordway/Compton intersection. While it is slated to remain in its current configuration following Fairfax's widening of 28, I would suggest it be made into a 4-way if the bypass gets built. Ordway will certainly have much lower volumes by then, and it'll be a straighter shot to the bypass going southbound.