they put out a new one each year just like the HBT anniversary beers (8-8-08. 9-9-09, etc). Which year are you drinking? It's beer! You can do whatever you want, however this beer is meant to cellar. It's nice to forget about a couple of bottles for a year or two and then crack them on a nice night!
It's this year's. Just bought it a few days ago and it's been sitting in my fridge. I don't really have anywhere to cellar properly, so I think I might just put it out of it's misery tonight.