The overclocking technology is called Intel Dynamic Acceleration Technology (DAT), it will boost performance by overclocking the chip but won't increase power consumption. This technology will arrive in May into the new 65nm Core 2 Duo CPUs as part of Intel's new Santa Rosa Centrino lineup.
The DAT technology works by overclocking one core when the other is operating on reduces power. Intel says this will boost performance, while keeping the power consumption balanced. This technology should be interesting for gamers as most of today's games still don't take advantage of multi-core processors.
The second new notebook announcement is about an "extreme" Core 2 Duo processor for gaming notebooks. It's not sure whether this part will be called Core 2 Duo Extreme or something else but we do know that it will be an unlocked chip to allow better overclocking.
Mooly Eden, Intel's mobility chief, also said Intel will start making quad-core processors for notebooks somewhere "in the future".