That ~8000 points on Geekbench multi-core is a turn off. I wonder when Apple made a new Mac which does less calculations per second than the previous one.
Well, actually they did it in the eigties and early nineties to offer more affordable Macs, but currenlty this is not the case. The high-end 2014 Mini costs as much as the high-end 2012 Mini.
They have other subtle differences (PCIe x SATA, TB2 x TB1, HD4000 vs HD5000). Actually, the PCIe storage only shines when you put 512GB or more, then you get those near-1GB/s speeds. Otherwise, it's not a big improvement over SATA III.
I think the current high-end Mini can be a great professional file server if you get the biggest SSD you can afford. Get a couple of these Minis (for backup and/or load balancing) and you can setup a scalable Dropbox/Drive/iCloud competitor. It's a nice deal as a device to play with fast I/O.
For multitrack audio work and photo editing, I'd keep the good and upgradeable old 2012 Mini. Hopefully a 2015 version will come with a fast quad-core Broadwell capable of reaching ~13000-15000 points on Geekbench.