Apple refreshed the 4 to lock up Christmas sales ahead of the Surface and Nexus launches. The Mini was rushed into production without retina to deal with the Kindle and smaller Nexus.
You and I see things very differently. Here's my take:
The iPad 3 was already fresh, just 6 months old, no one would have declared it old technology or not able to compete or sell well just before Christmas (especially because everyone was quite surprised when they refreshed it), and most people don't buy based on specs, except a few tech-oriented folks on forums like this one. The dock connector is not a reason to upgrade a device (or to buy one), especially when they could roll it into the normal upgrade of the device in a few short months - there is no big consumer benefit that makes it a compelling reason to upgrade a device (as many here attest daily, they are keeping their iPad 3s), and take a hit with the HUGE costs associated with upgrading and launching a new device into the market (R&D are not the only costs associated with product launches). So, it has to be some other reason they upgraded the device, and the logical conclusion is that they refreshed it to reset the yearly upgrade cycle to coincide with the mini launch (which is going to be a yearly refresh cycle) and iPhone and iPod lines. Now all are end summer/Autumn.
As for the mini, rushing it out isn't what happened - I don't see it that way at all, unless you want to slam the product or declare it to be inferior or a piece of crap (which several on this forum love doing) and which millions of thrilled owners all heartily reject. For one thing there are rumours it was late (supply chain issues), and these devices can't be thrown together in a few weeks or months; this thing has been in the works for awhile and a lot of thought went into it. Apple did a great job with the mini. Don't get me wrong I wanted a better resolution screen, but what they did do was actually quite brilliant and you cannot fault them for their decisions, you must applaud their brilliance. They created a form factor that is so incredibly compelling that it defines the device (it makes the mini, the mini) and is the main feature of this device (now and forever, which is great!), just as it should be. A smaller form factor iPad shouldn't be fat and heavy with low battery life, it should maximise "smaller form factor" in every way imaginable, because that's how it is differentiated from the full sized iPad (this is product strategy genius - product differentiation at its finest). Also, the screen is actually better than the iPad 2, which is a current product in Apple's iPad lineup, so the world doesn't see the mini as inferior or outdated technology, only people on this forum (and Android forums too<grin>). Now, let's look at what they did for the developer community and entire iOS ecosystem - on day one apps that were sitting there in the App Store got millions (!!) more customers for their products without any modifications to the apps whatsoever. Developers must be as thrilled as I am that I had so many app choices when I brought my mini home the first day - how different it would have been with a different screen resolution on the mini (and not really enough time before Christmas for all those developers to update their apps in time for the buying frenzy associated with these new devices opened on Christmas Day, meaning owners would have limited choices of great apps, making its value less than what it was and is).
The mini is selling so well now, proving that the lack of retina is not such a big issue with people (as it surprisingly isn't with me, which I thought it would be), and the majority of the market do not buy on spec, so processor speed and RAM are non-issues as it should be - the product performs wonderfully (it runs the apps which should be how you judge it), and that is what matters, not which particular numbers are etched onto a piece of silicon inside a case you'll never open.
As for release schedules next year, here's my thinking: the mini is a new product, and it is selling well (as you say we don't know the numbers but we can assume it's selling well), not the least of which reason is that there are still stock issues (here in the UK it's still saying 2 weeks). Given it's selling so well, there is no urgent need to rush to upgrade the thing (as there was no urgent need, pre-Christmas to rush to upgrade the iPad 3), that would be a huge waste of money, the product is in demand as it exists so they will take their time and upgrade it at the end of next year with what we hope is some version of retina (though, I'd love to talk with you and others about what everyone thinks is logical for a resolution for this device). A smart company doesn't cut off a strong sales and revenue stream if they don't need to, and upgrading the mini in March would do just that. I'm with you on this silly death of the full sized iPad, it's not going away and it's not going to become inferior to the mini - the products aren't in competition with each other, and owning one vs. the other doesn't make someone a winner for choosing the winning device, that's just silly and juvenile and so immature. Both products are great, and both will continue to get upgrades and Apple's backing going forward, and both will sit alongside one another, differentiated from each other in unique ways. Personally, I think we'll see one upgrade to the iPad line (both versions) at the end of next year, and I can't wait to see what they have in store for us. Exciting times ahead!