he's alive and undamaged which means the possibilities of him going home to his family and cas going back to heaven never to be seen again when the season finishes increase.

My thoughts exactly. You've highlighted all the reasons this spoiler made me feel bad-squirmy too. :|

As for Castiel/Anna - lol. I was reading these reports about Misha and Julie playing some scene like a breakup and I was going "Siblings? Hello? Siblings?" It just seems weird to put such heavy emphasis on the status of the angels as brothers, Michael and Lucifer in particular, Gabriel hammering it in, brothers not just in name but as having an actual family dynamic, and then turn around and go HEY CASTIEL AND ANNA ARE TOTALLY GETTING IT ON NUDGE NUDGE WINK WINK. It makes me feel nasty. And from the panel, it sounded like it's not canon (yet), so the writers could be intending it to come across as very sibling-esque, but I want to go up to the actors and be like SRSLY GUYS? SIBLINGS?