Part of that rethinking process is focusing on seemingly settled interfaces and how they function. PCI-Express optimizations and the general shape of Intel's power optimization framework are shown below.
Here's Intel's next-generation platform, Shark Bay.
LTR refers to Latency Tolerance Messaging, a way of informing the platform how much a device can idle without compromising responsiveness or capability. By 2013, Intel expects the majority of devices that hook into Shark Bay to support some type of additional low-power operation. Long-term, the company's goal is to turn as many of these blocks green as it can.