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Re:Apple to preview iPhone OS 4 this Thursday at Apple HQ by chrisbolt on Monday April 05, 2010 @01:56PM (#1242544)
The iPad software EULA actually mentions this. http://www.tuaw.com/2010/03/30/apple-to-charge-for-future-ip...

From that, it sounds like they will be charging for updates every two major versions, so not as often as the iPod touch.

Re:Apple to preview iPhone OS 4 this Thursday at Apple HQ by roc on Monday April 05, 2010 @02:31PM (#1242657)
I can't quite decide how to interpret that myself. (I admit I never considered they might be going to an every-other policy.) My theories were:

Pessimistic -- They knew 4.0 was right around the corner and that charging people $20 or so for 4.0 would go over like a turd in the punchbowl. So they're covering 4.0 but it'll be back to business-as-usual with 5.0.

Optimistic -- They're trying out not-charging for major releases but are reserving the right to change their minds again.