I know this thread is oldish but...
I didn't buy the collector's edition but I did just receive my code for the content. It took about 2 weeks to finally get it.
Even though the construction set isn't being released the same date as Fallout's release date, I will be getting it for the PC.
Eventually the game will get boring on the 360 (imo) due to the lack of content being released. User created content will keep the game interesting for a very long time.