Nov 2008 Tax Credit for existing Homeowners- A Question

I've only seen bits and pieces of the new legislation.

Has anyone seen a definitive answer to this:

The tax credit of 6500 is for buyers who have lived in their primary residence for the last 5 of 8 years.... But:

•Ø       Do they have to make the new home their primary residence?

•Ø       Must they also sell their current primary residence?

I.E., could the $6500 tax credit be applicable to a investor?

Thanks for your input!!!

Richard