After reading the technical specification of the Core 2 Duo (Merom) CPUs, and trying to make sense of Chapter 5 (see page 77), and comparing with the technical specification of the Core Duo (Yonah) CPU (see page 81), I got the impression that the Merom, although faster than the Yonah at the same clock/power consumption, was still sending out a lot of heat. So, unless Apple changes a lot of heat dissipation stuff on the Macbook Pro's, you will still be able to toast a piece of bacon on your new laptop.
Apparently, it seems that my impression might be right. This is AppleInsider, a rumour site, so YMMV. If you want to be sure of this, I would wait for someone who, unlike me and AppleInsider, really knows how to read those specs.