Keyboard question

With iOS 7, all third party apps still have the old-style keyboard, while all the built in apps have the new one. Is this something that devs have to switch on in their apps? I realize it's beta now, but when this comes out to the general public, are we going to have a bunch of apps still using the old keyboard until they update them? Based on how long it took many to update to the iPhone 5 screen (several of the apps I use STILL are not updated), this could be really annoying.

Or is it just a switch Apple has to throw?

Anyone know?