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It's 200 hours, not minutes. And i believe it's to account for Siri and location-based reminders having to poll the GPS more often than before.

He never said it was minutes...?

I just noticed this too and was about to start a new thread but searched the forum for this post. Interesting guess as to the reasoning. Definitely a downgrade but one that is livable considering the extra hour of 3G talk time is more important and I personally typically charge my phone everyday or almost everyday anyway.
 
I assume Siri is the reason. I will probably test it with Siri on and then with siri off just to see.
 
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