I must admit that response does make it sound like the disc includes an installer for Steam and nothing else. While that sounds (and is) ridiculous, I have seen other games go this route as well. ouch

Originally Posted by Halcyon

2. Is Steam required to update D:OS from the CE?
>> most likely a first day patch will have to be downloaded once installed,
yes

This part also seems to answer the question of exactly how many copies of the game come with the CE. At first glance one might assume 3 copies (one on the disc + two extra steam keys). Now it sounds like there are just two steam keys and no copy of the game on disc, one of which you will (apparently) be required to consume to activate the game on Steam.

At this point I'm pretty concerned about how exactly this is all going to play out come launch day. Steam will not allow you to add the same game to your library twice, and yet many of us already have a copy of the game on Steam. I'm worried that many people are going to be stuck with CE keys for Steam that they can't add to their account.