Intel's budget line of CPUs has remained based upon the older Sandy Bridge architecture, even though Ivy Bridge has been out for over half a year now. Reports have now surfaced that these low-end CPUs will be updated to the 22nm Ivy Bridge architecture by early 2013, even as Haswell gets close to making an appearance.
The current Pentium G870, G645, and G645T will cease to be produced as Intel makes room in their line up for the Pentium G2130, G2020, and G2020T. Similarly, the Celeron G555, G550, and G550T will be phased out in favor of the new G1620, G1610, and G1610T processors.
Intel is also planning on shipping dual-core mobile Ivy Bridge chips in Q1 of 2013. Haswell is widely expected to make its debut in Q3 of 2013.