We’re talking about printing plugins that adds to the 4.4 printer handling system. To be clear: this should work on any 4.4.x phone.
Let me start by saying: don’t expect miracles from it. Sure, it’s pretty nice and brought some cool things. But, it’s not the gigant leaps that earlier android version brought. It’s a nice step though.
And as always it might take up to two weeks for it to reach your device, nothing on my Swedish Nexus 7 2013 yet. Will of course do posts on it when I do get it, with my luck it will be in 2 weeks. Nexus 4 and Nexus 7 2013 LTE will get it later, as it’s “just” for wifi versions of Nexus 7 (both) and Nexus 10.