I suppose this entry from Roger's 'blog explains it:
So, tonight DaveFest enters its third weekend, and it does so once again without the beer that, for me, was pretty much the point of the whole thing.
A part of me realizes that this delay is a good thing. I think I've been quite honest with myself when I've said, "Self, when the Rogue Chocolate Stout goes on tap, that's all I'm going to drink. All those other beers will fade into irrelevance once my dark master reappears."
This way, frustrating as it's been, this way I've at least been able to drink a lot of my other favorite beers. It's been a time of tough choices for me, seeing all those yummy beers on the board at the same time. It's been tough, but it's been wonderful.