Verizon has finally published the changelog for their latest OTA update for the Galaxy S4 "VRUAME7". It turns out that they did indeed do much more than just patch root and further lock down the bootloader. Verizon produced a long list of "enhancements" that include. Touch recognition in VZ nav app, Battery Consumption for Group Play App, Stability in Story Album and Camera App, Hovering In Email Application, and Charging Status When Removed From Charging Pad.
Bug fixes include the repair of calendar user interface dialog dismiss issue, Occasional ISIS Mobile Wallet Activation Issues, Bluetooth connectivity with Ford sync issues, Occassional cases of garbled text when viewing videos (?), Instances where extremely large font was displayed in email, Notification alert issues when sound and shot selected in camera, Occasional issues of screen not waking up in cases of incoming calls.
Some capabilities were removed such as Tag buddy popup when a new photo is opened, The premium SMS popup during ISIS wallet activation, warning popup when transferring pictures to device/SD card. Some capabilities were added such as a new icon was added to indicate "more" items in the Notification Panel, Clear instructions regarding Smart Scroll, Wifi quick on off toggle, Secure boot status in about phone in the settings menu, and a new version of the SHealth application.
There were a few other feature that were added you can see the full changelog here. If you have not received this update I would suggest holding off until it has been rooted and a bootloader exploit has been found if you like Roms and Mods. There is currently a large bounty for the methods that will hopefully draw in some developers who would not ordinarily work on Verizon devices!