It’s a holiday miracle: we now have an importer from 0.5 to 2.x.
It’s in beta, and has only been tested for importing snippets as pieces, but should also work for pages. There’s no support for importing apostrophe-blog-2 posts as pieces yet. Pull requests are warmly welcome.
You can find it here:
Again, this is beta, but as long as you test carefully and back things up, there’s no reason you can’t use this for your one-time transitions of 0.5 projects today. We are.
Enjoy!