From Ars Technica:

Verizon has enlisted Google's Android mobile platform to help as it fights to regain lost marketshare from rival carrier AT&T. Verizon has also revealed that it will fully support Google Voice.

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Ultimately, Verizon's adoption of Android marks an important step forward for Google's mobile platform, which was previously only available through T-Mobile in the United States. As the largest carrier, Verizon has the clout to bring Android to many more users.
SWEET JEEBUS!!! NEW PHONE HERE I COME!