No, It's not a shock . But having used FCP 3, 4, and 5.0.x, They are all viable products. If all you need is FCP 3 (which I liked a lot because of its simplicity), then you're orphaned by this move.
The thing that troubles me is: what's up with FCP 5.0.x? That looks to be unsupported as well, since the document cites no support for anything prior to FCP 5.1.x. Again, lots of us still use 5.0.4, which was a good, stable version.
I'm on 5.1.? on a MacPro so it doesn't affect me, but I was hoping for much more in terms of basic improvements rather than new features from Retard, er, Leopard. Barefeats listed speed comparisons between Tiger and Leopard, and for things like FCP et al, there's not such a great difference. Even the fast G5s compare well under Tiger. So a move to Leopard isn't worth it. The speed should be much faster on an Intel quad, but maybe this just reveals how un-fast that chip is, compared with the PPC. Heck, even mu Quicksilver 2002 dual 1GHz is still pumping along.
I really think that Leopard got put on the back burner in the hoopla over the iPhone. Hopefully future updates will improve.
Oh, well. My machine is stable and runs well. Tiger is fine.
HarryD