I have a slight theory that they're holding 4" figures back to promote the new line look more than anything... 6", clearly took center stage. It'll be telling about 4" if they're playing second fiddle at SDCC though and 6" is equal to or surpasses them in what's shown.
If that happens I think 4" articulated figures are on their way out.
I'm curious, what 2 Clones for TCW final season were they planning? Hmmm... That's interesting, and will be a topic of some debate since they're eating up some 4" slots.