The iPhone OS 4.0 isn't expected to unveil until sometime next month -- possibly coordinated with the release of the fourth-generation iPhone -- but a glimpse of the beta reveals a number of features iPhone owners will be pleased hear are on the way. Here's a breakdown of the features likely to be rolled into the iPhone OS 4.0, beta 4.

Tethering
Yes, data tethering from AT&T looks like it'll be making an appearance on the iPhone. Finally. This feature is already available on iPhones overseas, and comes with a $15 extra per month charge for 3GB of data (30 cents per additional MB). This is plopped on top of your $30 per month unlimited data plan.

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