You see, some people actually uncovered a lot of the old game that hadn't previously been playable. Some kind of development copy got leaked and these guys got a hold of it. As the name implies, they've effectively been rebuilding the game themselves for about a year now.
The original game was released, but it was broken and unfinished and you weren't able to play past Onua's stage. Until the development copy got leaked, literally everyone thought it was lost forever.
As far as pricing, I don't know if they ever even contacted LEGO to officially hash that matter out. When they first got the disk there was debate over whether or not it was even legal to be rebuilding it, considering the game is still very much LEGO's property and was leaked without permission. The best they were hoping for was that it might have been so old that LEGO would have basically disowned and ignored it by now. I'm betting everything it's going to be free anyways, for legal reasons.
Here was TTV's original news about it: