Hikvision V4 NVR Firmware-North America-Out 1-6-2018

Hikvision is showing V4 NVR firmware (for North America) on their website:

http://blog.hikvision.com/blog/hikvision-north-america-launches-new-nvr-gui-4.0

They say it's applicable to their pro series NVR's,
1. DS-9632NI-I8
2. DS-9664NI-I8
3. DS-9616NI-I8

Anyone try this out and can comment on how it compares to their current GUI firmware V3.4.92? According to the download page Hikvision warns:

Software Description´╝Ü

Warning for I-Series NVR users: Before upgrading to v4.1.10 firmware. Be sure the NVR is on at least firmware 3.4.92. Failure to have the NVR on either of these firmware versions before upgrading to v4.1.10 could render the NVR in-operable.

I have 8 Hikvision cameras on my LAN.

I use the DS-9632NI-I8 and if I have set up the NVR with port forwarding (1 port-the NVR port-is forwarded in my router I have also changed the NVR port from 8000 to something else).

I access the NVR from the internet using IOS iVMS-4200 and, locally, I access the NVR directly on its NVR interface(HDMI monitor to NVR) via a mouse.

I'm wondering if the NVR security is now improved (or was it ever a problem with the way I am using it?). It's a bit confusing on whether NVR's have a security problem or just port forwarded cameras could have the problem?

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