Sounds like 4.3 is going out any minute now, though kind of a moot point, isn't it, since we should have 4.4 in our hands by early 2014?
Anyway, my sense from seeing 4.3 and then 4.4 on my wife's Moto X and Nexus 7 is I wouldn't hold my breath. Many of the changes from 4.2 -> 4.3 -> 4.4 are pretty subtle. Others like ART sound super on paper but are fairly minor in practice.