The feature pull for ACPI and power management updates to be introduced in the Linux 3.9 kernel
This merge does incorporate the recently talked about fixes/improvements
and other power-related updates
. Notable to this merge is the new Intel P-State Linux driver
To this 3.9 feature merge is also ACPI power resource handling and device PM updates, support for the Intel Lynxpoint LPSS, a cpuidle driver update including Intel Haswell support, a cpufreq driver for Marvell Kirkwood SoCs, cpufreq support for Calxeda Highbank ARM processors, a cpufreq driver for the Freescale i.MX6Q SoC, and support for lightweight suspend. There's also fixes and minor improvements scattered throughout for cpuidle, ACPI, and ACPICA.
In regards to the lightweight suspend support, the new Linux kernel feature is talked about within Intel Driver Works On "PM Suspend Freeze" Support
The merge to the mainline Linux kernel code-base of these ACPI/PM updates happened earlier today