From multiple articles
around the net it appears Apple is finally updating the Mac Mini, with release in the next few months. The good news is this is expected to be a real upgrade to suit the professional server market, though at this stage it's rumour territory only. Yet to be divulged is user-upgrade potential (RAM, graphics, SSD) and connectivity options.
I've been using the Mini for many years, with maxed-out RAM. It's always been rock solid dependable, running LR4 and CS6.