It has been brought to our attention that the latest version of the metasploit package on the community repository fails to upgrade due to an unresolvable dependency issue.
We recommend our users to run:
pacman -Syyu --ignore metasploitto be able to keep their systems up to date.
We are not maintaining metasploit anymore as it was announced here, so please contact the upstream maintainer of the package about the issue
UPDATE (10/02/17): This issue has been resolved and users can update normally now.