Shipping Tumblr and WordPress

Surely they're not getting rid of Tumblr's streamlined 'tumblelog' post UI/UX right? So what are they talking about.... the functionality will just be using a WordPress posting API in the background? Which to all regular users won't look or feel like 'WordPress' really. Feel like WordPress means the experience of using that blogging UI. Which I guess is why the conclusion here is "you won't even notice a difference from the outside". Making this kind of a non-story.