It' possible to have an information to know when a snapshot is released?
Or a place wehere we can check if it is released?
Snapshots can always be found at http://www.pfsense.com/~sullrich and won't be announced officially. They are testing snapshots like the name says already and thus are not tested in depth. However, they usually should only provide bugfixes and therefor should be better than the older versions but be warned. You have to monitor the directory for changes by yourself.
Now I know the dir to monitor...
Are there snapshots of the embedded version?
Yes, the *.img files are for the embeddeds.