I still think the iPads should have shipped with 2GB of RAM.
Other than that, ever since I've had mine, I've been lamenting the fact that it doesn't have Touch ID. I've become so accustomed to it on my 5s, that I find myself holding the home button on the mini, waiting for it to unlock.
More RAM would be my vote, followed closely by the color gamut. But I'm also a professional designer and photographer, so I have reason to actually care. But as I'm not planning on doing color work on my Mini (unless Adobe launches the Lightroom for iPad that they're working on), I'll be ok with the Mini for now.
Actually, my rMini just came in the door. Literally, UPS guy just delivered it to my office as I was typing this. Color looks pretty good coming from an iPad 2 previously. I don't think it will be a huge issue for me, and definitely not for most people.
I actually don't mind that the rMini doesn't have Touch ID. It is a bit weird going from my 5s to my rMini, but I'm sure I'll get used to it. Plus, my iPhone goes with me everywhere. My rMini basically stays at home, so I really don't have the need for Touch ID on my tablet.
Other than that, I kind of wish Apple stuck with the $330 pricing on the rMini. I don't believe Apple raised the price of the iPhone 4 when it was introduced to replace the 3GS. But again, the $70 difference obviously didn't deter me in purchasing the rMini.
...Other than that, ever since I've had mine, I've been lamenting the fact that it doesn't have Touch ID. I've become so accustomed to it on my 5s, that I find myself holding the home button on the mini, waiting for it to unlock.
I have a very large music collection, which up to now I've been loading on an aging iPod Classic. I could load it all (barely) on a 128GB model, but it would leave me no room for anything else, or for additions to my collection. I can get by with a new genre "Do Not Sync" and syncing the rest of the collection by genre, but I'm still close to limits at 128GB.
I don't think that Apple will ever sell a 128GB iPod Touch, so the mini seems to be as close to a replacement for my iPod Classic as I'll ever see. And yes, it does function very well as an "iPod Touch Maxi", better than the actual iPod Touch that I keep around for app development and testing.
gamut of course lol...but seriously, given how much more likely the mini will be taken outside, I think Touch ID is a huge feature that is missing. I predict gold being added as well haha. The usual hardware upgrades will come I suspect, like the RAM/proc, wireless etc.