Need a refresher about imaging and to know if anything is new or changed

The last time we had an image, we installed SEP, and like 75 PC's had the SAME Hardware ID, so only ONE showed up as a managed client in SEP. Going back was a pain in the neck, I hade to make a few modifications in order to get it to work.

We are doing this once again, and what I want to know, is how can we install SEP on these images WITHOUT it picking up the SAME ID. I want the PC's to be added, managed and have their own UNIQUE ID's.

I would also DESPERATELY love to NOT put SEP 12.1.2015.2015 on these and put the NEWEST one on, when is the scheduled release for the next version?

These will ALL be Windows 7 64 BIT PC's