We also didn't expect an iPad 4 just seven month after iPad 3. Whatever the reason was for such a short cycle might happen to the Mini, too.
But you are right: get one now is ok, as you can use from now on (wow, that is wisdom)
the reason the ipad 4 came out at the same time as the mini and just before the holidays was for Apple to reset their release dates enabling them to move to a 12 month ipad (5 and mini 2) cycle....