Please don't create bug reports that are questions. If you want to ask a question, then ask in the newsgroup.
I believe that the primary reason that TypeTuple isn't deprecated is that it's used a _ton_, and deprecating it would result in a flood of deprecation messages in many projects. And while personally, I really don't like leaving aliases like this around, I don't think that either Walter or Andrei think that it's all that big a deal.
So, while we may yet deprecate TypeTuple and move towards getting rid of it, there isn't much of a hurry to do so.