Gord Lacey over on TVShowsonDVD.com put up a small bit of info about Columbo Season 6. He just mentions that his "sources" say it should be out in November. This seems to be to sooth fears by some that the release won't be out until next March 2007, due to the expiration date on the coupon included in the Season 5 release.
Indeed, but I think the intrigue centers on how Universal intends to issue the season. I mean, even on two discs, there will be lots-o space left over.
However, they did give "Blueprint" its very own disc in season one, which I always thought was as stupid as its pain-in-the-unrealistic packaging, but they've come a long way since then.