I agree. The Mac Mini and iMac will get a bump to Haswell in Q3 or Q4.
The notebooks will be in the limelight for now.
Hopefully the Mac Pro falls into place between now and end of 2013.
It's almost unreasonable to say anytime before Q4. January of 2014 is inline with mac mini release times.
The current mini is quite nice, if you need a new computer, it's not unreasonable to upgrade now.