With SUL2, after account creation you should be silently redirected back to the page you were on when you click Create account in the top right nav. . So newly signed-up users don't see the GettingStarted "Welcome" page until E3 does some work.
Shortly after CentralAuth and the config changes (InitialiseSettings.php 'wmgCentralAuthSilentLogin' defaults to true, probably others) were deployed to the cluster, I created an account on en-beta and this didn't happen: I wound up on Special:GettingStarted. So perhaps some additional configuration needs to happen on the beta cluster; chrismcmahon suggested I file a bug.