Remember that clients should not be depending on the specific query string data returned inside the query-continue node, with either the old-style or new style continuation.
As a partial fix for bug 24782[1], Gerrit change 22742 will cause action=query&list=recentchanges to start returning rccontinue for continuations rather than rcstart as it has done in the past. Changes of this type may be coming to other modules as well as further fixes to bug 24782 are implemented.
[1]: https://bugzilla.wikimedia.org/show_bug.cgi?id=24782 [2]: https://gerrit.wikimedia.org/r/#/c/22742/