Migrate DC VM's to Hyper-V 2012 R2

I am preparing to upgrade my Server 2008 R2 Standard Hyper-V Host to Server 2012 R2 Standard with Hyper-V

All of my VHD's etc reside on the 2nd volume, therefore my install will just go to volume 1. 

Will moving my SBS and secondary DC from Hyper-V 2008 R2 to 2012 R2 cause any issues? 

I won't need to actually copy the VHD's (which I've heard is risky), but it will install the new Integration Services and I fear it could cause Domain issues.

thanks in advance,

Jonathon Praay

jonpraay@gmail.com