Their current policy doesn't permit them to share personal information with other entities or even "affiliates". They would probably need your consent to change

Their current policy doesn't permit them to share personal information with other entities or even "affiliates". They would probably need your consent to change this. They could merge Nest Labs, Inc. into another Google company, letting the surviving company use the information. The press release does not disclose the acquisition structure but their statements suggest the company will survive as a separate entity.