Boot up times
Five second boot up? Nice - but unlikely; boot times have been getting longer with each Proliant generation, to the point that G7 takes almost 2 minutes just to light up the screen and another 2 to finish its internal diagnostics and disk array initialization, then you finally get any add-on card BIOS startup times as well. I'd be glad just to see that cut to 15-30 again.
The new Atom server coupled with iLO sounds awesome - our power budget is already strained and adding new VM hosts is becoming a major chore. Networking is still more pressing than power for us, though; Procurve prices are still astronomical compared to competitors' better-managed equivalents.