I frequently use an NBT editing program to check on the status of my villages i.e. population, size, etc.
However, during the snapshots I have not seen it update. Not only does the current village not update, new villages will not show up.
Please do not mistake this for the Village.dat file, which updates perfectly. It is only the original villages.dat that does not sync or update.
Therefore, structure data is stored, but specific Village data (population, reputation, doors, radius, etc.) will not change.
I have attached the villages.dat, and Village.dat files for examination in case someone finds something I can't. I have also provided a link to the world in my public dropbox. (The two .dat files are in the world .zip folder, but I have them separate as well.)
Link to world folder download (no adfly, mediafire, etc.):
https://dl.dropboxusercontent.com/u/98444970/Snapshot%20survival.zip