A couple things video wise to note about the new firmware:
-C4K 24p has given bitrates of 100-150mbps in the handful of test clips I conducted in a not well lit environment. Previously I was struggling to ever get above 60mbps in basically every situation. Haven't tested extensively but it's a noticeable increase in their variable bitrate.
-1080p 60p/24p seems to look basically the same as before. I haven't been impressed with the 1080p quality on this camera so I tend to not use it.
Olympus has also released a LUT to convert their FLAT profiles to 709:
http://cs.olympus-imaging.jp/en/support/imsg/digicamera/download/software/3dlut/3dlutdl.cfm
-Mostly just seems like a curve adjustment, doesn't do much to the colors.