I sometimes wonder if being a miserly, pessimistic, cynical dilettante, who wants pro performance for a mini price is a prerequisite for being on this forum.
I wanted a computer that was occasionally easily transportable. I did not, and do not want a portable, and have been well pleased with both the Mac Minis I have owned.
My first computer was the 2005 original (0.25 GB of RAM and 20 GB HDD). Getting OS X was an unexpected revelation, which freed me from having to do battle with Windows on the computers at work. My second computer, which am still using, is the early 2009 (1 GB of RAM and 120 GB HDD) that I am still using, now with an extra 4 GB of RAM and two external HDDs, 1 TB for Time machine and 500 GB for extra storage. Both cost me a bit over a month's pay with Office for Mac installed in the 2005, and iWork in the 2009, and I stumped up for upgrades to Snow Leopard and Mountain Lion.
I could now buy a mid tier 2014 Mac Mini for about the same money (my pay has increased less than 10% since 2005), and would not have to stump up for iWork or OS upgrades, thus overall it would cost me less. However, by the time I do need a new computer (in a year or two or more), a new generation (or two) of Mac Mini will almost certainly have arrived.
No news is good news. If Apple decide to kill the Mac Mini the news will be announced, just as they did announce the demise of the 11" MacBook Air. However, Apple are well known for not giving away much in advance about upcoming products. I see no reason for them to cull the Mac Mini from the line-up. It continues to fill a niche.
Why release a new computer before the biggest selling season, when tills are ringing up sales of trinkets and baubles to fill Xmas stockings? Or as annual new models as is traditional in the US car market (but not really elsewhere). Folks I know buy a new computer to do stuff, not as a present, or to show off how avant-garde they are. Buying decisions are made at any time of year. Apple has released new Mac Minis at various times of year, as and when design and production are sorted and ready.