Chinese-language site HKEPC is reporting that Intel's first mobile quad-core processor will be the 45nm Penryn-based Core 2 Extreme QX9300. The chip will clock speeds of 2.53 GHz, have 12 MB of L2 Cache and 1066 MHz FSB. The QX9300, however, won't be part of the Q2 Centrino 2 launch because it is a 45W processor and current motherboards are designed for 35W chips. [HKEPC via Register Hardware]
I hope you realize that a hotter chip with a bigger battery still doesn't solve the problem of cooling the chip itself. More power used = higher fan rpm = less battery life.
You really don't want to go back to the days of the Mobile P4 chips with 1.5 hours of battery life and tugging around an AC adapter, do you? We worked so hard for our Pentium M chips and their successors!