I just came back today after a long break from the game. I tried the v1.4 in the training mode, and I am not sure if the new interface is the right direction for this game. I played the game because it was fun to collect the cards, build decks, and challenge different opponents (btw, the arena was a great idea), but I got bored eventually because there are not many cards. The game just needs many more cards. The current interface is fine to me.
I think the interface of the game right now is pretty much an empty shell. Yeah, there are NPC already, but it still isn't the final version of the map (at least I think Zanz said that some time ago) We still haven't seen the new quests, and we still haven't seen how much we can develop our "characters" in the final game (all we now till now is that there are 10 levels right now, each providing 5 HP. Zanz said that that won't be everything.)
About the updates of cards: Yeah, I as well, hope for at least 2-5 really interesting new cards in the bazzar, and maybe 1 or 2 rares (i don't think that we need more "rare-series" like shards, weapons or nymphs)
but constant new cards (like in magic or yugioh or pokemon) pose problems as well. Older cards growing weaker, and the lose of interest because the cards will always be "more colorful and creative" then the ones before. Simply, they get more complex, and there come more complex (and strange) abilities all the time. I quit Magic and Yugioh because of that, and many others as well, because the "original" magic that we experienced (8. Edition, Mirodin, Kamigawa) changed so fast that we didn't want to keep up with it anymore. About Yugioh, it was even more fatal. I started it when it came out. Most creatures didn't have abilities back then, and the strongest equipment spells gave about 500 ATK, and there weren't any themes back then. The only cards connected where fusions and the parts of exodia. -----> Anyway, I quit both games because they were changing at high speed and didn't feel "original" anymore. And that's the reason why I am still stuck with elements after years.