I guess it doesn't go without saying.
It would be pretty silly to have a screen that works solely with the MB. Of course, having two 24" screens with different plugs is almost as silly, and making people buy an adapter that is a requirement is the silliest.
How unlike Apple.
The new 24" might well be the silliestest move Apple made in the past few years, just for the sake of creating another niche ?
Anyways, as for the topic, I just got me a MacPro.
The main reasons for not waiting on a new product, as already mentioned above, were a possible lack of affordable Ram and compatibilty of existing hardware, and being reluctant to buying a rev. A product.
With Apple usually taking it's sweet time updating the workstations, I don't expect to see an improved and bug-free Nethalem MP within a year, same with OS 10.6 and 3rd party extensions, let alone adaptions for programs.
So my (uneducated) guess would be there'll be a rock-solid, fully supported Snow Leopard MacPro Nethalem rev. B by early 2010.
In the meantime, I hope for 10.6 to further improve excisting technology, and that they don't devolop it to mostly benefit 7i architechture.
And then there is the despersate need for 12"MBP, in case I havent mentiond it