Not consistently received but a 2+ year old "feature" where Marriott sends you a reminder email about 5 days in advance telling you about the property and weather and the chance to pre-order some expensive arrival snacks for your room. And within is a spot to make some comments about your arrival, i.e time and preferences. This is where I usually make (again) a request for an upgrade or CL room - the first being the 45 character box. You reply and get auto generated return message and in rarer cases will get an actual response from a person (presumed to be the hotel's concierge?). And the message is no more than them saying the will do their best to honor.

But, the seem to come only if you reserved way out (say 2 or more weeks) and at FS or REN's. And again, not consistently.

And 50-50 sucess without more begging at checkin...