Usually when a new line of processors is introduced, the old line is slowly phased out. There's not much point of them releasing any performance Dual cores beyond the E8600. They'd rather those users switch over to Core i7 that will have higher margins and maybe they'll be able to sell a new board or two while they're at it. I just read today that Intel has released the budget E7300 with plans for an E7400 as well.