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Move from analog to digital
To improve the information gathered from situational awareness, long-range observation and designator systems, the big trend is to increase the resolution of the daylight video cameras from VGA to HD and 
greater for more accurate full motion video content. Higher resolutions allow for an increased field of view (FOV) with equal DRI (detection, recognition, identification) capabilities or increase DRI from further distances.
There are efforts in both the military and other global security areas to move from analog to digital to meet the video intelligence goals and other networking needs. With digital there is no degradation of data over the interface as with analog there is more noise with longer cables. The video recording that is enabled with digital allows for distribution over long ranges.
Some legacy systems that have switched to digital used what was available at the time such as those from the broadcast market, such as SDI, or from the machine vision market, such as Camera Link or GigE Vision. But now the interface has become a limiting factor in supporting the bandwidth of greater resolutions and frame speeds, and there are many high-speed interfaces to choose from.
To determine which video interface would be best for your next daylight camera upgrade, it is a good first step to identify which interface requirements are most important for global security systems.
See the presentation below for a comparison of the pros and cons for Camera Link, HD-SDI (and 3G-SDI), USB3 Vision, CoaXPress:
