Likely 2022 primary calendar

During the Pennsylvania Supreme Court's hearing on the PA's congressional voting map on Friday, 2/18, lawyers for the Department of State provided testimony (starting around the 2:10:00 mark, and articulated in their brief) in which they came out strongly in favor of keeping the primary at 5/17 instead of moving it. 

Further, DOS proposed two different nominating and petition calendars, leading up to the single May 17 primary. The Court appeared to react kindly to this schedule:

In short, the statewide and congressional nominating period shrinks by a week, while the legislative is down to only 9 days. Between March 11-18, SCOPA will decide whether to hear any legislative challenges.