It seems that I'm not getting new snapshots since yesterday night using portsnap.
I'm always getting:
Fetching snapshot tag from ec2-eu-west-1.portsnap.freebsd.org... done.
Latest snapshot on server matches what we already have.
Last files in /var/db/portsnap are from Apr 15 23:28 (CEST).
If that could be of any interest, it seems that files in /usr/ports has been updated from r438599 and r438601, while not from r438600.