The page on StackOverflow includes a 'migrated to' block, but the ServerFault page only includes a 'migrated from' block - there's no 'migrated to' block to follow it to SuperUser.
Yeah... The "migrated" indicator feels rather tacked-on. In addition to only keeping track of a single migration, if you close a migrated question the timestamp for the migration changes to the close time.
I gotta figure they were reluctant to add a new table or column to the existing table, and instead they're piggybacking on close status or something...