It took Apple quite a bit of time to unify iOS across the iPhone/iPod touch and the iPad.

Jan. 14, 2011 - PRLog -- If there's one thing that came out of CES this year, it's that everyone, and I do mean everyone, wants a piece of the action that Apple absolutely dominates with the iPad right now. Tablets, tablets, tablet, tablets. We'll see dozens upon dozens of them released this year. So how will Apple meet the onslaught? With the iOS 4.3 beta that just got pushed to developers today, it looks like we may have a first glimpse of the answer. One that may also point to the big answer: iPad 2.
As Macstories points out, a part of the iOS 4.3 beta looks to be new gesture support for the iPad. As they write:
Maybe the iPad 2 unveiling will also serve as a iOS 5 roadmap, which Apple has done in the past as its own event, outlining what's coming in the next iteration of the OS so developers can get ready. Perhaps Apple doesn't need developers to get ready for these gestures because it seems as if they'll be system level. As in, third-party developers probably won't have access to the four and five finger multi-touch options so that Apple can ensure they work in the same way for the new level of multitasking.
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So you have to believe they don't want to fragment it again. So maybe the timeline is this:
   * iOS 4.2.5 will launch alongside the Verizon iPhone on February 3.
   * Then in February/March, we'll see the iPad 2 launch with iOS 4.3 for all iOS devices. At that time, we'll get an outline of what's to come in iOS 5.
   * And iOS 5 will launch in June for all supported iOS devices alongside the iPhone 5.
Maybe you heard, Verizon finally has the iPhone. Or it will, in a few weeks. And you know what that means: it's time to advertise the hell out of that bad boy. But don't be surprised if it's Verizon doing more of the pushing than Apple.
Reports today have Verizon putting their significant 'marketing muscle' behind the device in the coming weeks. This should be no surprise given what they've done for the iPad — a device which doesn't really even directly connect to their network (though that will change).

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It's also in line with what we've been hearing for month: that Verizon was getting ready for a huge push in Q1 around some new mobile product. The assumption has long been that this would be the iPhone.
And then there's what Verizon did for Motorola's Droid products. Thanks largely to a massive multi-million dollar ad push, Verizon was able to make the Droid the flagship Android device — and that's despite Google releasing their own Nexus models. And interestingly enough, many of the 'Droid Does' commercials took indirect shots at Apple and the iPhone. So these new Verizon ads for the iPhone could seem a little awkward at first.

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