I have not seen any such lockscreen update. When I updated to PR1.3.1, it only updated libmaemosec-certman-applet0, libmaemosec-certman0, libmaemosec0, maemosec-certman-applet, maemosec-certman-common-ca, maemosec-certman-tools and mp-fremantle-generic-pr and nothing else.