I think the way you (PG) states developement steps is not a big favor for your customors.

First, kowbody knows if there is really a 2010 Mac version on the way.
Maybe we have to wait until 2011, or 2012 ?

If we buy a 2009 and next month apperars a 2010, we need to spend additional 69 or 149 $.
Maybe good to give customers a update discount inside a timeframe.
(as like Apple does often)

I think, It would be a good thing to tell costomers a bit more of timeframes
and features.
To know, that there is a real developement.

thanks whxde