As you can see by my signature, I had one for 42,000 miles. I reeeeaaaallly miss her too. But, there is NO way that engine will fit under the hood. Maybe you could spend a few Gs and have it mounted mid engine style.
As for the 'baby' powerstroke, it is true, Ford will be releasing a V6 4.5 litre version for the Expedition/F-150 platform for '03/'04. I have a feeling that engine would not fit in a Explorer either. The problem is not so much the length of the block as it is the height. The baby version will be based off the G-2 powerstroke (generation two). The G-2 will be a 6.0 litre and crank somewhere around 350+ HP, the 4.5 is slated to pound out 275-300 HP and roughly same torque. All said, when they release it, I will wait 2-3 years of production (b/c they are using camless technology on these badA$$es) and will either get an F-150 SuperCrew or Expedtion with it, Manual tranny of course!
Hold your horses and we can all get one of these animals!