Past experience. A single disk release is almost always following by a "Deluxe Edition".
More money to be made that way.
I think that has become the exception more then the rule in the past few years. I can name plenty of big summer films from the past few summers that have only seen 1 release so far. I'd love it if I'm wrong but, I just think it is highly unlikely that another version will be release by November or December of this year as some have speculated. At the very least, I wouldn't expect a second release until sometime next year.
Again, this is all just my opinion and I could be completely wrong. In fact, I hope I am as I'd have no problem buying it now and a more feature loaded edition again in a few months. Kinda like how I already bought the Hobbit BD and will gladly buy the extended edition in November.
There's a single and 2-disc version on BR of the 2009 movie available in the Netherlands.
Yes, but in the US the 2 disc was released first and the single disc was released almost a year later.