Interesting. What kind of usage have you observed?

I have come across similar use of "revert" in private correspondence from old-fashioned lawyers at small high-street law firms in England. As a rule of thumb, if a solicitor writes that they will "revert to you shortly" you may expect:

* They are fairly close to retirement. * They don't know much about laws that have changed since about 1980. * They almost certainly won't get back to you in a reasonable time unless you repeatedly send reminders. They are probably hoping that they will be able to retire before having to invent a meaningful response to your enquiry.