DeviceLogix editors have always been embedded in other software products. I'm familiar with using RSNetworx for DeviceNet to launch the DeviceLogix editor, but it also exists as a module of DriveExecutive and as part of the variable-speed drive configurations in Connected Components Workbench.
For the E300, I think that RA has packaged up the DeviceLogix editor inside an Add-On Profile for the module, so that it can be launched from within Studio 5000.
RA Knowledgebase Article ID # 626729 suggests that AOP for Version 5 of the E300 firmware will be available "Fall 2015" and there's a Version 5 AOP on the AOP webpage that was released a couple of weeks ago.
I'm downloading and installing that right now to see what it does.
If you can access that technote then you will clearly see mentioned that...
"The E300 overload relay can be used as a stand-alone device. The user will need to first set the IP address and access the embedded webpage to configure the FLA setting, enable trip conditions, etc."
It then goes on to link you to...
587563 - Setting the IP address on the E300 Overload and accessing the embedded webpage
Access Level: Everyone