OCWorkBench claims the performance of Intel's Sandy Bridge integrated graphics will be about 25 percent faster than current LGA1156 chips.
Additionally, the site also heard that motherboards based on the H67 will not support overclocking.
Basically, the P67 and H67 do not differ much from it’s predecessors the P55 and H55. Basically the P67 is discrete while the H67 has graphics output ports on the mainboard.
One thing to note is that the P67 and H67 will support new series of processors with LGA1155 socket. Thus, your current processors won’t run on the new boards with new chipsets.
The new processors with 1155 is slated to be launched in January 2011 or so. The new embedded graphics on these processors is said to have a 25% improvement in performance over the current LGA1156 processors.