It always starts the same way with Intel: they release their new, high-end architecture to the top of the product line at the start. The remaining older silicon and design continues to be sold as the low-end chips to deplete supply. The failed high-end chips and excess supply then start trickling down into the lower-end chips.
Ivy Bridge was launched all the way back in April, a fair time ago considering the speed at which PC innovations continue to move at. It was only last month that Ivy Bridge finally made it into the Pentium line of Intel CPUs, and by Q1 2013, it will be nearing an entire year since the original launch of the architecture.
The new Celeron chips will reportedly be named G1610, G1610T and G1620. They will still feature two cores and 2 MB of L3 cache. They will also continue to lack Hyper-threading and Turbo Boost. The new Ivy Bridge models will support faster memory as well as a slight speed bump on the bottom model. The top two processors will feature a lower TDP.