I have a SFO-LHR flight on 7/15, originally a nonstop, changed to SFO-ORD-LHR now. I haven't clicked "continue with change" on united.com yet. I don't think they even emailed the flight change to me.
If by chance they do reinstate the nonstop, I guess I would have to call and ask to be put back on the nonstop?