Finally after all of the rumors, Panasonic has been gracious enough to give us V-Log for our GH4 cameras. For those of you who do not know, V-Log is a flat, more gradeable profile like the higher end Panasonic cameras features. To have this give you the ability to manage the color a bit easier with your video editing program of choice, i.e. Adobe Premier, Final Cut Pro X, Avid, etc. The V-Log will grade very well with its Panasonic Varicam 35 Footage.
The upgrade is currently at firmware 2.3 (2.4 has now been released, get it here) which can be downloaded from Panasonic's website. To access the V-Log profile you will need to purchase the upgrade kit through Panasonic online store or online retailers such as Adorama or B&H Photo Video for $100. The kit includes instructions and an SD card with an activation code. This code is necessary to update current GH4 camera and keep it enabled after future firmware updates. New owners of the Panasonic GH4R will have VLog preloaded on their cameras so no changes will need to be done.
Available directly from Panasonic webstore: Click Here
Here is a sample clip by "Geekynerddad" from Youtube.com that gives a good visual of the VLog-L profile and color graded examples. Follow him here.