Alright, by no means am I disappointed in the iPad Mini or the iPad, but I think this is a pretty uncharacteristic refresh for the company.
Lightning is definitely part of the reason for this refresh, but I think that the main one is to differentiate the iPad mini from the iPad, keeping the iPad as the main device. Without the refresh, the iPad Mini would be as fast as the iPad, and probably a bit quicker too, due to its lower resolution screen. I haven't played with the iPad 4 yet, but I do notice the occasional stutter on my iPad 3 that I didn't see on the 2 or the 1 - presumably due to the resolution. It sounds like the A6X in the 4 fixes this though. With the Retina MacBook Pro and the iPad 3, I'm not sure that I can go back to a regular screen.
With the iPad Mini being a (relatively) slower, smaller iPad, I feel like Apple is perpetuating this notion that what you're paying for in a device is screen size. Selfishly, what I would have preferred to see would have been the iPad mini having the Retina display and an A6X processor - even if it sold at the same price as the iPad, or maybe $100 less. I have no idea if this would have been viable from a market perspective, but this would have put the Mini as a first class device along with the iPad. Again, not disappointed, but I thought that it was a strange move. I wonder if this is just a first generation thing, so that they can have the iPad 2 - new iPad divide with the minis as well in the future.