Mike,
There is some information on some logic changes in the e2guardian.release file.
Normally, if you want strict white list filter then you would put the sites you want allowed into exceptionsitelist and exceptionurllist, set blanket block in bannedsitelist, and leave greysitelist and greyurllist empty - same as dg. In this set-up no content checking is done, just url checking.
If you put urls in grey lists those sites will be content checked. The effectiveness of content checking depends on what phraselists you have active and how well you have tuned these to your requirements.
One change in E2G is that in DG https sites that were in the greysitelist would be allowed through without any content checking, whereas in E2G the greysitelist is not consulted when a https site is requested so only exceptionsites https sites are allowed in blanket block mode.
E2G should have the options you need to set up the filtering in any way you require, and if this is on a single network then you are able to do this with one server for different groups of users by defining filtergroups with different levels of access.
Regards
Philip