g is a somewhat code word for year....
, not seems too likely. Analysts points out to new iPhones in June. Maybe can be paired with the awaited iOS 7.0 . June-July sounds to me as WWDC 2013. But I will be happy seeing a new Mac Pro just in summer time. And new minis and MacBooks with Haswell can come out in the summer-first days of fall timeframe. And yet, some rumours tell about new iPads coming in spring time. So, I am not seeing a last part of the year overcharged with Apple products bursting out the pipeline....
But I can be proved wrong, either by reality of by people with more insight/knowledge.