Those purples certainly look nice, but also keep in mind we've got other collections with lots of shadows coming out. Would you be kicking yourself if there were great purples in that Doublelux collection or in Fashion Sets, for example?
For me, it's usually the toss up between liking a group of colors vs. wanting to wait for new formulas - I'm a thrill seeker and mostly just go for the new formulas!
I literally own 2 MAC quads, 1 holiday shadow set and 1 of the Carine compacts - that's it.
All that being said, I'm still very curious about the purple set in this collection, but I'm going to wait to see it in person for sure. If only one or two of the colors really rock my world or are very different from what I already have, it's a no buy for me.