So, I'm downloading the Windows Phone SDK 7. Don't ask why.

I don't know.

How different is developing for 7 and 8?

Is there any way to know until it's released?

I don't really want to learn something that's only going to be relevant for another two minutes.

Which is why I should probably continue ignoring Microsoft.

But if anyone can sort of explain how the the process of developing a Windows Phone 8 app changes from the process of developing a Windows Phone 7 app that'd be worth a start.