All of the decks I've made post DGM release have not shown the deck type. All new decks display "This is a complete [GW] deck." instead of "This is a complete [GW] Standard deck."
Any decks made during Gatecrash were showing Modern / Standard etc. If I edit a Gatecrash era deck it loses its type description and displays the above description. The one deck type that is displaying correctly is EDH when modified. Even my pauper deck lost its pauper classification when I edited it after DGM release.