There really hasn't been any guidance issued. All they've said is, "under current guidance, a reasonable, good faith interpretation standard applies with respect to governments. See Notice 89-23, 1989-1 C.B. 654, and Notice 96-64, 1996-2 C.B. 229, see §601.601(d)(2) of this chapter." Announcement 2011-79. (The announcement deals specifically with Indian Tribal governments, but seems to be applicable to governmental plans generally.)
Personally, I'd be a bit wary of treating a city and a board of education for that city as separate employers, and thus treating the teacher as having had a termination of employment. But you know your client's risk tolerance better than I do.