Define what you mean RTM updates, Zukona released about 30-40 RTM updates that were never released to the public and probably never will be. Is that what you are talking about ?
Those are microsoft unreleased updates. There has been some question here as to whether or not you should use them. I will say this though. They are unreleased by MS, so you should use them at your own risk. I haven't heard about any real problems related to using them, but many here have opted to use only the released updates through W.U.