Anyone have any info on a Sin City SE for the UK? I really want to know. I really want to buy Sin City, but I don't want to buy the normal one and then find out a SE is being released a few months later.

Exactly, just buy the US R1. The UK will probably get the SE at a later date, just as we did with Hellboy, but that could be up to a year away. Who knows what goes on in the minds of the people at BV? To be fair though, the UK is a much smaller market than the US, so releasing them both around the same time here isn't good sense from a marketing point of view.