Hi Thodi,
I'll point you to a few different thinks.
For current R11 Users, this gives a nice comparison of R11 vs. R12:
Studio R12 for R11 Experts - Quick Reference Guide
Though it's slightly outdated, I think it gives a nice overview of R12:
What's New in TBM Studio v12
Let me know if this helps or if you have any specific questions I can help address.
Thanks,
Justin