I installed the version of apt from wily-proposed and then completed an upgrade from Wily to Xenial using that version of apt with the libgcrypt packages installed.
From /var/log/dist-upgrade/apt-term.log we can see the following:
Processing triggers for man-db (2.7.4-1) ...^M
Setting up libgcrypt20:amd64 (1.6.5-2) ...^M
Setting up libgcrypt20:i386 (1.6.5-2) ...^M
Setting up systemd (229-4ubuntu4) ...^M
I installed the version of apt from wily-proposed and then completed an upgrade from Wily to Xenial using that version of apt with the libgcrypt packages installed.
From /var/log/ dist-upgrade/ apt-term. log we can see the following:
Processing triggers for man-db (2.7.4-1) ...^M
Setting up libgcrypt20:amd64 (1.6.5-2) ...^M
Setting up libgcrypt20:i386 (1.6.5-2) ...^M
Setting up systemd (229-4ubuntu4) ...^M
So I think this is verification-done for Wily.