Earlier this last week, Apple Canada lowered its prices significantly. For example; the 17" Powerbook went from $3699.99 CDN to $3499.99. But today at Best Buy, they lowered the 17" to $3199.95 CDN. I asked the resident Mac fan-boy about it and they said the price was lowered to make way for the Rev D PB which will be sold at 3499.99
I think this makes concrete the fact that Powerbooks will atleast get a good little update.