can someone shed some light for me regarding the 2 and 3 ch ddr3 setup?

1. why is the 2 ch coming out later, seems to me that would be the lower
performing one.

2. i take it the 2 ch does not relate to dual channel and 3 ch to triple
channel, if so why ddr3 dual channel, wasen't the hole point of goin to ddr3
to get an additional channel besides the change of memory access pattern?

thanks

btw, i wish they were here next week. a whole year of waiting