Tech waits for no one.
I have to agree here, you can wait for the: BBD (Bigger, Better, Deal) that is just waiting around the corner. Or you can ask yourself if the current mini will do everything you really want it to do for the foreseeable future to meet your needs and give you a return on your investment.
For me? That came in July of last year when I finally bite the bullet and bought my first new mac ever. A 2011 i5 to replace my Dual 1.8G5. So far? I love the hell out my mini, I did the ram upgrade, kept the stock hard drive. And to be honest have never looked back. I know I will get every penny back I spent on that mac and them some.
For me, it is not about being the guy with the newest toys on the block, it is about having the tools to get done what I want in the most efficient way. So your needs, wants and perspective will all have a huge part to play in either getting in gear and getting that new mac, or waiting for the dust to settle on the "new and improved" mini we have yet to see.
~Drake