What technology is necessary to gather that much video so quickly? Is that video feeding into a central hub? This is Dubai, a relatively tiny country. Did they build this technology themselves or did they license it.
PR. What's to gain from releasing this? It's fascinating but long. It's definitely not put together as a soundbite, in fact it has no sound.
What are the security implications of releasing this information? Will it make future assassins think twice?
What about the privacy implications? If you were incorrectly identified as a lookout what would you do to clear your name? The story includes some Israelis who share names with the assassination team who are freaked out right now.
The technology is CCTV http://en.wikipedia.org/wiki/Closed-circuit_television. It is imported from all over the place and is probably not feeding into a central hub. In most countries UAE included it is found in all hotels, airports and Shopping Centers. The assassins for sure knew about it but because of their modus operandi did not worry about it. If you notice the end of the video says the hotel staff opened the room 17 hours later and that the latch was locked from the inside. They made the murder appear as a heart attack (other reports at the time) reported it as electrocution - probably killed him by inducing a heart attack via electrocution.
The team scattered to different places and all the names and nationalities mentioned are probably false. They also probably had multiple passports and on leaving Dubai appeared in another country with a different name.
Deleted comment
After edit: this quotation from the submitted article, "The door on al-Mabhouh’s room was latched and chained from the inside, and there was no blood evidence," shows more tradecraft than I have for leaving a modern, secure hotel room and ensuring that the assassination scene will yield little evidence and not be discovered at first.
The real question is the motivation of Dubai in making and releasing this video. I highly doubt that it's as an advertisement for the mossad (even if it may end up coming off as such).