Necrons and Tau but also Sisters of Battle should all have a new codex.
Personally i think SoB might be pushed to next Edition.
I hope they give all amries an update, including Dark Angels (which is very unlikely, and it is said there'll be an updated DA codex soon ?)
in any case, i just spent a SHITLOAD of money on all kinds of GK stuff, including ForgeWorld stuff, and i'm nowhere near done, but that'll come in the next few months.
Painting is a different matter, since i don't like the painting...
And as we all know;If it ain't Dutch...It ain't Much !