Schiller told Gruber that they are moving to yearly updates like iOS, so I would not be surprised.
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iOS updates are free though. I wonder if Lion updates will be too! Buy a mac and get lifetime updates (provided the system can handle it); just like when you buy an idevice, you get lifetime updates to iOS (provided the device can handle it).
I do hope that is the new model coming in with the yearly updates. It makes much more sense to just factor in the price of the software and updates into the purchase price of the device rather than every year feeling like you are being nickeled and dimed.