Patching the PE with ME scripts should be no problem, as they are essentially the same. As for patching earlier releases with PE additions however, that might take some time to do, but we do plan on doing it eventually, yes. It's at the very bottom of our "to-do" list though. There's not much new content in the PE that isn't included in the ME anyway though. The PE is basically the consumer edition of the ME, since the ME was limited print. I believe it's the same as the Vita version content-wise, but maybe with different aspect ratio graphics and audio quality. I think it has an extra CG that wasn't in the ME, and an extra sprite, and maybe higher quality voices.