In the post, the Amazon Kindle Team says:
We apologize for the confusion. Our new Kindle Touch 3G enables you to connect to the Kindle Store, download books and periodicals, and access Wikipedia - all over 3G or Wi-Fi. Experimental web browsing (outside of Wikipedia) on Kindle Touch 3G is only available over Wi-Fi.
This means that 3G will work for aspects of the Amazon ecosystem but "experimental web browsing" (ie. anything else on the Internet) will have to be done over Wi-Fi. It's unclear why Amazon decided to kill 3G functionality if not to keep its users on its own sites. The announcement is especially unwelcome news for users hoping to check email or browse when on vacation (Amazon's 3G service works worldwide).
The Kindle Keyboard 3G will still allow for "experimental web browsing" over 3G and Wi-Fi.