But it's been great timing for a new Mac Pro for a long time.
Check out the design of last year's invite:
Very colorful, many different colors of rounded squares, in many different sizes.
Everyone thought the design and colors of the invite was some kind of hint at a new product. There was a lot of speculation that we would be seeing iPhones in different colors (besides black and white). There was speculation that this would hint at some kind of new design trend for iOS, some people thought it had something to do with a TV, etc. And we have seen how that turned out....
Given that Ive is now in charge of UX as well he will want/need to differentiate himself from Forstall. And iOS/OSX are definitely due for a major overhaul.