Ok, u have announced v4 in march. It's experimental build.
When you will release a stable build with SDK for plugin developers? In november, i think? 3.07 to 3.08 took about a 4 month, but still 3.08 isn't a stable build.

So it's not "OctaneRender 4 is here" it's "OctaneRender 4 is somewhere, but ...