Maybe they fucked up and were still finishing the trailer when the power went out and corrupted all the files, or someone didn't save the work lol. Either way maybe they've had to start from scratch, or an older version of the trailer.
No They are definitively done with the trailer, they probably have been for awhile now, there just not going to release it with there main office down.
Also, game informer will most likely have screens and info from/about the second trailer, which is why rockstar choose to release the trailer before gi, so we will see the trailer before the 8th if November for sure.