The new OCS R2 version of the UC Voice Specialization exam was released on the 4 May 2010. Details of the areas covered in the exam and training available (just the OCS R2 Voice Ignite Workshop). Full details can be found here.
I can’t give details of the exam beyond what is in the Microsoft Learning site but if you know your OCS voice and have attended the Voice Ignite Workshop this should be straight forward for you. I think it is a better test of knowledge than the old 74-924 R1 version of the exam but that is my personal view of it.
Good luck if you decide to take the exam.