New stable =/= 1.0
I'd imagine there's a fair amount left to do on the overall progression front before they're going to be comfortable in saying that Starbound is "released."
Ah, my mistake. I must have misread something, I could have sworn they were considering the next stable release as 1.0.
No complaints here, I've got a Guild Wars 2 OT5 to work on in about 200p posts (and there's a big announcement tomorrow so that'll probably fly by).