There have always been worries about hosting your data with a 3rd party NSA hyperbole or not. This is why you follow HIPPA standards if they are applicable, or ensure AWS is compliant with a standard you need to adhere to: http://aws.amazon.com/compliance/
Your company will always have to value the risk/reward tradeoff of hosting with a 3rd party and it has nothing to do with secret courts or any other silly end of the world predictions, and has to do with the fact that your data is outside of your direct control.
You may have no problems with these things. I'm not a US citizen and these things do matter in my decision to host my data in the US. These problems are not new. The US never had a strong privacy law.
Taken all this into account it's hard sell for any business outside of the US to use US based cloud services. That's all I wanted to illustrate.
Yes there are FISA warrants. If you are this paranoid that your data is this sensitive you shouldn't even be thinking about keeping your data anywhere else besides your locked down datacenter that you alone have access to.
What I am stating above is, NSA revelations or not hosting your data with a 3rd party is an obviously inherent risk.
Your company will always have to value the risk/reward tradeoff of hosting with a 3rd party and it has nothing to do with secret courts or any other silly end of the world predictions, and has to do with the fact that your data is outside of your direct control.