Yes, admin part it is.
WordPress often use wordpress.com as their playground for new functions. They have alot of users in there for testing. If they think that some feature is really good there is a chance it can be added to the self hosted wordpress.org.
If they roll out this new admin to wordpress.org, almost every plugin will stop working (often options are added as admin pages). It’s probably not around the corner.
It’s still interesting that two cms:es does the exact opposite and both are successful, in their own measure.