Question is.... will any devs port anything to run on the SE that "dont have the power" to run on the standard ?
I think that most developers agree that 256 MB of RAM is more than enough for emulation, and also there's the video memory of the GPU available. Maybe with PSX or N64 they can skip some optimizations, but 512MB is too much, not really usefull on a handheld that's not meant to be a multitasking device.
It's like the high end video cards with 2GB of video memory... there's no game that uses that amount of video memory, you'll need to open more games just to use all of it.
That's the only difference from a developer point of view, I think I've read that the SE has also more GB on the internal SDCard, but that doesn't affect any application.