Sure, the next version is always "on the way". But FCP4 just came out and new versions don't usually appear less than a year apart. Always waiting for the next version will keep you from actually doing anything.
If you are insisting on waiting, I would go to Barnes and Nobles or similiar bookstore and pick up a Final Cut Pro book to start reading and familiarizing yourself with the terms, shortcuts, etc. so when you get your system you will have book knowledge of how to run your system. Actually sitting down and doing it while you read is the better option though (if you had the system!)
FCP 2 & 3 were both released in January at the MacWorld shows. FCP4 was released sometime last summer. The dates are getting further apart. I wouldn't count on a new release within the next 8 months. So if you can wait that long, by all means.
-CJ www.arkhamfilms.com