I'm pretty sure we will have to wait till NAB starts. Samsung probably wants to counter other manufacturers releases with this firmware update. 4k crop mode, H.265 10bit 4.2.2 or 8 bit 4.2.2, 100% CAF improvement, AGC disabled, Nicer 1080p 120fps, 1080p or 720p 240fps, better timelapses control.
Samsung can do a lot with this camera.
What I would like to know, there's a eSATA port on the NX1, would it be possible to plug a Hard Drive to it, in order to use it as a massive storage for photo/videos/timelapses? If so, it would be very handy for a big production.
Knowing that the firmware is Linux-based, it opens even more room for third-party custom firmwares, I'd love to see what Magic Lantern Devs could do. There's a rumor that Samsung was communicating with them.
I think we might have another bugfix soon though.
Let's wait and see...