No specific info about version 4.0. Please visit the main page of Migration Assistant on Mac Informer.
Info updated on:
Password Assistant simply calls the Mac OS X Password Assistant dialog on demand.
Migrate information to a Mac running OS X Mavericks.
Migrate data from a Mac running Leopard to a new Mac running Lion.
Solves an issue that prevents the transfer of data from Leopard to Lion.
Migrate information over FireWire, Ethernet, and wireless networks.