No, plans on hold, as early review warns many issues with this iMac, maybe the iMac 21 with retina if loaded with an competent gpu, but not this, the screen is wonderful breakthrough, but innards are weak, being loaded with 4x the pixels of previous iMac 27, the gpu it's only 70% faster, it would need twice this improvement (an nVidia 980m it's much more faster and thermal efficient), this it's only the beginning, let's see how this AMD gpu gets older.
Those purchasing this, never miss paid for 3yr extended warranty, I suspect will experiment much more GPU failures than mean iMac due it's higher work load on the gpu and not exactly generous cooling features.