Looks like people have had their fun.
The common wisdom (on all these forums) is get a new Mac when you are ready for one. Waiting for 'next Tuesday' is a mugs game and only leads to lost productivity and disappointment.
Innovation happens. Things get updated. Sooner or later, your new computer will be old.
Specific to now: MacBook Pro updated a month ago to the latest 'penryn' chips from intel. Loads of people waited ages for this update only to realise that it offered little in the way of noticable speed improvements.
I still use a G4 PowerBook and I love it. My housemate got a new MacBook Pro this week and although it looks almost identical, it is so, so , so much faster and since plauing with his trackpad with the iPhone like pinch and zoom and scroll, I have found myself doing it on my PB with no effect!
Short Answer: Recently updated-
Buy Now
Hope this helps, although I hear rumours circulating about a new medium sized X-Mac. Could be worth waiting for!