Well, the updating I would imagine would be done by the launcher, really the only thing would be revenue sharing and I'm pretty positive that valve already has a standard in mind, even if they don't tell us.
Presumably there would be no problem with Blockland updating as we have our own launcher, but in reference to other games currently greenlit or hoping to be greenlit, they may not have their own launcher to make updating easy.
For a number of games updates consist of you having to go to the game website and downloading the latest version.
And if Steam has to incorporate that then there is some work on their side to do, so you'd likely have to discuss with Steam how exactly they go about uploading new updates and how long it takes them to do so. If you want say, a Halloween update out on October 31
st, you could likely release it on the day on your website, but Steam might not be able to get it out that quickly if it's just jumped on them.
But that's all speculative and nothing that we personally would have to worry about. But I imagine it's one of the things that Steam discusses with greenlit game devs. The thing holding most greenlit games from being released is likely just their current state of completion and when Steam is able to fit them into the timetable to be released.
(Since I would imagine Steam would prefer to release them at an optimal time. If you release it at the same time that a brand new mega-selling game comes out, like a new Call of Duty game or other big-seller then you might not get as many sales on an indie game as you might get when you release it with no big sellers being released)
