Okay, did some power consumption tests with my Pandora.
The display uses about 0,5W (lowest brightness), should be about the same with the new one.
While booting, the Pandora used about 2 - 2,5W (so similar like the OMAP5 devboard). Without display that would be 1,5 - 2W. However, the Pandora had all features like USB, etc. completely disabled, so it might be the same here.
After it has booted into the OS, consumption goes down to 0,85 W (or 0,35W without display). When only moving the mouse, consumption goes up to 1,5 W (or 1W without display), it goes down to 0,35W when you stop moving the mouse. That's a pretty good sign power management is active here :)
On the OMAP5 devboard, it stayed at a steady 2 - 2,25W when using the desktop, but that was with all features enabled (HDMI, network, USB, etc.) and running with 2 Cores.
As power consumption never went down, I'm pretty sure there was no power management active. We just don't know at what clockspeed the 2 Cores were running right now.
When using the Playstation emulator (same config as on the OMAP5 devboard), power consumption goes up to about 3W (or 2,5W without the display). However, once again, the power consumption was going up and down all the time, depending on how much CPU power the PSX emulator was using.
As a reminder, PSX emulation on the OMAP5 went up to 4W, and it didn't go up and down, it stayed that way.
So if Power Management really is switched off on the OMAP5 right now and we can enable / disable cores on-the-fly, we should be pretty good here.
Additionally, the XServer is still running using fbdev only, without any hardware acceleration (which will probably lower the power usage as well).
Maybe enabling power management is something we should look into soon, so we can do some real life tests with power management enabled.