Yes, instructions are included with the upgrade patch. After you submit your configuration for testing to our Engineering department we will send you the patch plus the instructions. You can go straight from 70102 to 801.
There is no web-based management console for v8.
Check out Dave Gold's post in this thread - https://community.mcafee.com/message/169656#169656
At present v7-to-v8 upgrades have to go through the support guys. The hope is, in the longer term, that there will be a simple patch process, but at the moment this isn't globally available.
Version 8 - like all the versions before it still uses a stand-alone Windows-based GUI for managing the firewall - though there is the comprehensive CLI also.