You'll find all that info about print quantities etc. if you read the biweekly bulletin:
http://about.usps.com/postal-bulletin/pb2013.htmI find them a very good read. The next one is due this Thursday.
I don't think anyone knows how these imperf press sheets will perform in years to come. Personally, I calculate the print quantity for each individual stamp rather than the print quantity of the press sheet. There are some with more than 1 million, and there are others with 10k like the Modern Art in America issue. The next closest was Earthscapes which sells for a premium, but the one with the third lowest print run (Purple Heart Medal) is not doing well at all. And of course, there are popularity & stamp design to consider. Hence, I think the Lunar issue may do well. But we are all in the dark about the potential value of these.
The biggest problem I have is that USPS don't sell individual panes as you have to buy an entire press sheet even if you are only interested in one stamp. This will make it very expensive to own a complete collection of them. Also, when it comes to reselling you're better off cutting up the sheets. Finally, you'll need a lot of space to store them!
To answer your question, yes, I do think they'll go up in value and mainly because of the low print run and the nice designs (there are plenty of stamp collectors that collect art on stamps). This issue will be less popular than the Muscle Cars for sure though (esp. among rednecks :-)).
If I would have the choice to spend approx. $20 on the latest Express mail stamp or an imperf press sheet of the Modern Art in America issue... - well, that's an easy choice for me.
I pretty much stopped collecting the conventional US stamps now as they have literally no chance of gaining in value. But I do collect the imperf press sheets instead, although it stretches my finances!