Haven't been able to confirm it, but someone posted on one of the other message boards I read that an October date for an Into the West DVD set was advertised during the miniseries last night.

thanks for that adam

i investigated further

it's released october 4th and you can pre-order it from here http://nbcstore.shopnbc.com/product/?storeid=2&familyid=N60559&track=1113&Deptid=1113&rap=2379