Spoilers
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I would like to know what the heck everyone was getting so anxious over, if the coffin only held a mummy. Maybe it was just everyone sensing the building up of tension between the various sides in LA.
When the kindred sensed something powerful enter the city, they all just assumed it was the coffin which arrived in the city at the same time. We discover in the end that it wasn't the coffin, so it must be something else:
Though it's left open in the game, the files reveal that the taxi driver Jack introduces you to is in fact Caine. I'd place my bet on him being what they're all sensing (after all, he's even more old and powerful than what they thought was in the coffin).