IPad – What resolution (in pixels) should videos taken in the new iPad (3rd generation) be

Effectively yes - you should not expect to be able to use a Verizon iPad on an AT&T account or the other way around. The next two paragraphs only apply to the US iPads.

Internationally (outside the US), the micro SIM slot is unlocked, so you will be able to insert a non-AT&T/non-VZW card in either and have service without needing to jailbreak the device.

See: http://www.apple.com/ipad/4g/ - the section on selecting a carrier and ready to take on the world.

I found the answer from iMore's How to turn on and use Siri-like Dictation on your new iPad:

If Dictation gets confused about any of the words you speak, it will underline them in blue on the screen. If the word is incorrect, tap it to get a popup menu with alternatives. Tap an alternative to switch to it. You can also simply edit voice dictation text like any other text.

Sure enough, single-tapping on Claire gives me an option to change the text to Clare, and of course it works other ambiguous words.

A particularly useful example is when you mean Buy, and the dictation types By, with a blue underline. Tapping on that gives the two alternatives Buy and Bye.