Man, I never got all the last round.
Making it easy not to care at the moment. 
I did get everything in the last round and I'm starting to not care as well. It's one thing when you release a slew of parts and then let them be your stock for 2+ years and it's an entirely different thing if you're going to trickle out new parts here and there (like the Santa Hat that just showed up in the hat bins one day and now these four new domes).
My hope is that these will be the last of the parts for a while. The black/orange R0 is a nice fit with the rest of what's been offered the purple R5 is also a good fit even if it's a bit too much like the red R5 from the TFA 4-pack. The updated White/Yellow R6 is "different enough to make you mad" but does fit nicely with the new white/yellow body released.
The new white/brown R6 dome however, that one is a real mystery to me. There really aren't any body parts that cleanly "go" with this dome. My thinking is that there are some new body parts coming at some point since we now have a second done highlight color that really doesn't correspond to any of the body parts.
Since there are also four new domes, I have to wonder if these were designs from a second (and aborted) TFA-themed 4 pack.