Today I found a new StackExchange site https://codereview.stackexchange.com/, and I'm sure I'll see a lot of questions in my RSS, which I will want to vote to send there, but I can't.
History tells this definitely will not happen until the site "releases" officially.
If you see a question that you think would be a better fit for another site not on the migration list flag it for moderator attention explaining where you think it should go.
Moderators can migrate a question anywhere on the network.
It could be code review (I just flagged one to migrate it there yesterday) or it could be some other site, like game development. I would like to see a text box labeled "other" below the standard options to suggest the place. Of course, the mods will then act as they seem fit, but that option may make their job a little easier.
I lold. I just found it today, too.
Flag for mod, "belongs on code review" and we'll migrate if appropriate.
Which brings up a question... how do we know? A code review question is pretty much on topic for both sites.