I actually bought the new iPad, and it is my first tablet. The name "retina" display is marketing, but the screen is still very impressive. Even my friend, who has an ipad two, was impressed. You can tell the difference, and it is not like ATT changing their 3g logo to 4g on the 4s.
I have to disagree with you on your first three points of what you dislike about it.
I have a 4s, and siri is very gimmicky. I wish it was able to open apps and be better integrated into nonapple apps, plus it seems to be down a lot. If they improved it, then I would like to see it on the iPad, but I doubt that will happen until we see it lose the beta tag. Great concept, but poor delivery so far.
I believe a LED flash would be useless on the iPad. I feel like if you need flash it would be smarter to use your phone. It would be easier to take pictures, and I believe the quality would be a heck of a lot better. Plus you look silly taking pictures on an iPad. I think the camera boost was more for video chat than actually taking pictures.
I can understand wanting a different looking ipad, but the ipad is still very nice, plus it is not like they have many ways they can change the style. I think the iPad will be similar to their laptop/desktop line in that it will stay similar for a few refreshes with just the internals and screen improved.