27" Retina Thunderbolt display please! Thunderbolt 2 can hand it just fine, and the new Mac Pro has sufficient GPU for 3x 4k displays.
But I bet it will cost $8000, which is $50 more than it's worth to me.
Retina iMac? That will have to wait longer, I fear--due to price.
P.S. Make it all-black to match the Pro, AND for the love of Pete, make the keyboard and mouse black too! Why the white?? Apple hasn't made a white Mac in ages, yet the mouse and keyboard still have...