Hi,
Some points I can give you are:
- software blade architecture: new licensing mechanism that is more flexible and will be cheaper for most customers (but don't expect a lot cheaper

)
- IPS is the "new" Smartdefense, rewritten from scratch and designed to function better with lower load on the system. You now have a packet capture ability and follow-up feature on the new signatures.
- SPLAT went from 2.4 to 2.6 kernel (there has been a 2.6 R65 SPLAT version, but it wasn't mainstream)
- VMWare support was added. Everyone knows you can run a smartcenter on vmware and now it is officially supported
- Smartworkflow for better rule base management and follow-up
- provisioning of Edge/SPLAT firewalls
- DLP (data leakage prevention) introduced recently
- windows username and pc name can be put in the logs, using a WMI connection to AD
- Smartconsole is now built on the .NET framework
management itself didn't change that much. The log viewer has a different layout for the detailed logs and the addition of windows credentials/packet captures and a few IPS options that guide you to the correct protection being hit. If you want to see the difference, install both the R65 and R70 smartconsoles on your pc and run them in demo mode. That way, you can see the management interfaces and what changed.