[[ I don't like the fact that the SSD that you add isn't covered by AppleCare. You also have to be very careful not to damage any of the Mini's wiring or internal parts when you add the SSD ]]
There's nothing that mandates that a fusion drive has to be interally installed.
One could buy a bare SSD, and buy an external enclosure or USB3/SATA dock, put the SSD into that, then use Terminal to "forge" a fusion drive that uses the internal HDD _and_ the external SSD.
Once completed, speeds will be all-but indistinguishable from an internally-mounted drive.
You haven't risked damaging anything by opening up the Mini, and you'll have the SSD easily "in hand" if there's a warranty issue.
The only disadvantage, if you consider it to be one, is that you'll have an additional peripheral on the desk. So what?
Yes, that is exactly the point... but if for some reason you did want a faster internal drive that is still covered under the regular one year warranty or a three year AppleCare and you didn't want to risk adding an SSD internally then ordering the fusion drive for the new Mini is another option. Also I am not against installing an SSD internally if that is what someone wants to do... but it's important not to have a false sense of security. Installing an SSD does involve other potential risks. As you indicated... using an external drive via USB 3 or TB port could be set up to work well without having to install another drive internally on the 2012 Mini.
Last edited: