It's been over 2 months since it was announced, and I don't think anyone knows exactly what this means for NavisWorks or its' users.
On Friday afternoon, I received the form email notifying me that the acquisition is complete. Without actually saying anything, Autodesk let me know that they "current plan to continue the development and support" of NavisWorks. Their "vision for the acquisition...is to continue to provide the east of use and product interoperability" that NavisWorks has.
We'll just have to wait and see.