If they're still requiring to know the question in advance, it's still high-level scumminess. Allows for easy deflection of that question, then ensure that journalist doesn't get to ask questions again.
Guardian reports that Conservative HQ are pissed with Michael Crick's tweets - apparently they select journalists day-to-day i.e. on rotation so everyone gets a question eventually. If they hadn't been keeping May away from the public so far then this wouldn't be a story, so it's still their own fault for being over protective.