The Intel G45 and P45 chipsets will likely be released at Computex in early June 2008. FUD Zilla writes both chipsets will start sampling in April:
Intel is making the final touches to its upcoming G45 and P45 chipset lines. It still has to launch X48 that will happen this quarter and after this time it will launch much faster G45 IGP, sort of DirectX 10 compatible and a new desktop P45.
P45 will naturally replace P35 generation and it doesn’t looks that advanced. It just brings the PCIe 2.0 to the mainstream market and that is about it.
G45 has s new graphic core branded as Intel GMA X4500HD but both P45 and G45 support FSB up to 1333 but not faster.
Both chipsets should be ready to go to the manufacturers in late April that should give them enough time to prepare the boards in middle to late May.