So wrong
Dude, mixing those colors do not get you orange. They'll get you some murky dark color.
I read through this thread before posting to check if someone had already thought of my theory on this invite and was shocked to see nobody had.
It's totally obvious, and the product has nothing to do with art or drawing or painting or anything like that, although it could possibly be used to draw/paint on if it is a tablet.
Notice all the different colors. Red, yellow, blue, pink, green, grey and a little purple. If you mix all these together, you get the orange color in the middle. Notice how the orange only appears surrounding the Apple logo. Therefore, what the invitation is implying is that Apple has taken different aspects from many different products, and mixed them together into a single product. Just like they took all the surrounding paint colors and mixed them together to form the orange color around the Apple logo. Examples: touchscreen from iPhone, battery from MBP, software from Mac OS X and iPhone OS X, etc. etc.
The speculation now should focus on which technologies they're bringing together from which products. Simple invite to solve, really. The "creation" bit of it plays right along with the solution. They "create" things by taking a number of different parts and putting them together to form something better than the parts by themselves.
--mAc
Dude, mixing those colors do not get you orange. They'll get you some murky dark color.