Uh, no, it is definitely an "actively developed operating system".
As for user visible, actually, yes, changes made to dtrace recently for example.
Sparse zones as another example, and so on.
Remember that Solaris (and its derivatives, unlike Linux) is userland + kernel -- not just the kernel. So changes in userland count in my opinion when considering "actively developed operating system".
> As for user visible, actually, yes, changes made to dtrace recently for example.
> Sparse zones as another example, and so on.
Those changes came from SmartOS/Joyent and were not made by the IllumOS developers.
Don't get me wrong, I really appreciate their work, but I've already lost hope with IllumOS/OpenIndiana... Fortunately Joyent stepped in, so I hope that things will speed-up a bit now :)
I'm aware of the difference in the number of developers, but you have to agree that there are hardly any user-visible changes since onnv_147.