Asymetric crossfire can work when your complete setup is designed for it. If(!) the GFlops somewhat resemble the actual performance of the GPUs a 2:1 frame-ratio may be the way Sony want's to go with their design (if the rumours are true at all), if a game wants to have really nice graphics (if not the extra power may be used for physics-calculations or maybe calculations necessary for the move-controller etc).
So for each 2 frames the dedicated GPUs processes 1 frame is processed in the GPU-Part of the APU. This would result in 50% more FPS compared to only the dedicated GPU doing all the work.
10-15fps increase doesn't tell you much if you don't give the FPS the games ran without the crossfire setup (a 10-15fps increase when running at 20-30fps before is a big deal). Most of the tests with PC-Hardware use test scenarios where none of the coming consoles will be able to deliver high enough framerates.
And really: The problem with the APU in desktops is the DDR3-Ram. Tests showed that the HD 6550D is capped with Ram with a speed lower than ~1500Mhz. Even if you use 1866Mhz-Ram you still get capped if you only increase the clock-rate by around 20%. But with GDDR5 you can essentially get each bandwidth you want, so bandwidth isn't a limit anymore at that point and you may overclock the GPU-Part(!!) of AMD's APU. Afair an increase in that clockrate (as long as you don't have to increase the voltage!) doesn't lead to a high increase in power consumption.
But even if the GPU in the APU can't be used to it's full power, I don't think that it's right to just ignore it. It has to be somewhere on the tables on page 1 (just put a note there that we don't know how it will actually be used).
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