Don't count on it. Further, it seems that the people being upgraded lately are getting it WITHOUT asking. It seems to me the request is a big negative (if anyone has asked and been upgraded recently please let us know). Also, I think many of the recent upgrades are from std. to pool view...Which, IMO, isn't worth asking for.
I'd try to have a nice conversation with the CM at check-in and if the chance arises perhaps you could say something, but I think a request that was obviously planned from the start is doomed to failure.
The only guarantee for a Savannah room is to pay for it.