[genter]

> The chance of them migrating all the application code to use some kind of hacked about wordpress theme is absolutely zero.

Dunno why you'd say that, that's the exact thing I'd expect them to do. I realize it's idiotic and will end in failure, but I still expect them to do that.

[evanelias]

No, that doesn't even make sense as a concept. Tumblr has its own templated theme functionality. Users can pick one of many thousands of existing themes, or fully customize one from scratch.

So it sounds like Automattic would need to implement a conversion layer between Tumblr's template language and data model, and the corresponding ones in WP. Their functionality and data models also don't line up 1:1 conceptually, so this is no easy task.