well they wont be converting over every fab they have to 45nm right away.
i would imagine for machines that will support ddr2, and say single and dual core lower end machines they will keep supporting it. i would doubt any 32nm 775 cpus though. but the same thing happened with their 65nm fabs when 45nm came out. they still kept producing the e4600 / e4700 and they still produce e2200 and celeron 400 chips even though some lines have moved to 65nm. I would imagine it will be at least another 6-9 monts before they have all cpus moved over to 45nm or better.. and chipsets on 65nm.