You can find some info here. That page has a map on which you can find four and twelve year plans; other tabs on the page have different maps that include current and completed projects.
One project on the map:
Project No: 91845
Title: PA 28/Highland Park Bridg
Type of Work: Interchange Improvement
It leads to this report (PDF), but it’s just one page with not much detail. There’s also a link to a “video log”, which has lots of tiny details on each segment of roadway (how many drains on this particular 34 feet of exit ramp, that sort of thing).
The PDF probably has the most useful info:
Work Can Begin: 10/14/2019 (Estimated)
Completion Date: 02/13/2021 (Estimated)
SR 0028 (Allegheny Valley Expressway) at the Highland Park Bridge Interchange (S.R. 8050) between Highland Park Bridge Road (S.R. 1005) and the Delafield Avenue Interchange in Aspinwall and Sharpsburg Borough and O’Hara Township, Allegheny County.
Interchange improvement to address the existing bottleneck conditions by reestablishing and accommodating two continuous through lanes through reconstruction and lane restriping within the existing roadway footprint with minor widening on SR 28 (Alle