Apple has confirmed several times that a new MacPro is coming, so I believe them. There have been some good blog posts recently about this, notably Larry Jordan’s. The spat Apple has with the EU that has resulted in them not selling MacPros in Europe is mostly irrevelent. (Not completely, as you’ll see in a moment…)
So I’ll jump into the fray. Yes, I’m playing armchair psychologist here. I have no inside info and am making all this up based simply on having watched Apple intently (and been subjected to their whims) for 25 years as a customer and developer. Take it for what it’s worth.
So why the about face when it looked like the MacPro was done for just a year or so ago? I think the main fact is that Steve Jobs is no longer with the company.