I have a feeling that this year some of the replacements will be higher in price than their predecessors. Simply due to exchange rates.
It's hard to put prices up on existing models, but a new model with improved features can probably just about justify it. The Panny AE3000 is more than the AE2000 for example. However I think we'll also see that some companies are expanding their line (rather than just replacing one projector) so that they can have a higher-end, higher price model and some lower ones too. Epson and Mitsubishi for example.
This allows them to charge a bit more for the top-end model. While still including some new features on a model which is the same price as the predecessor.