Estimated completion date is the end of next year, but enough is already on line to be VERY useful, and the gaming content has been expanded immensely.
At the moment what they mainly need is bug reports; not so much omissions, which are only to be expected at this stage, but things like links that go to the wrong entry, weird behaviour, etc. But before sending anything in. PLEASE read the information on the news page etc. so that you know what the current issues are.