No doubt the authors are very busy, but like Ferris says "life moves pretty fast" -and with 2.10 at RC2...
As a fall-back position, a page on this site for the 2nd edition that had a list of "changed at 2.9, refer foo-bar" (like errata but not) would make the 2nd edition a lot more attractive (and be good prep for 3rd I guess). I just want to be certain I am not heading down an out of date path.
A "buy 2nd edition, get 3rd when it happens" package deal would also be enticing.
[I have 1st edition and am very pleased with it -it starts every morning and gets great gas mileage]