Check out this link. JMS said that season 1 will be comming out on DVD this fall and will include AT LEAST 2 eps with commentaries from him. Hopefully WB will do this release in the smae style of the X-files DVD releases.
http://www.midwinter.com/lurk/misc/dvd.html
The Season 1 box set is due for release in Europe on October 14th. I believe it's on sale in the US in November.