Really looking forward to this and fingers crossed it works out!
I'm afraid I cannot really comment on the interface changes, as I was pretty used to the old version. And frankly, I liked the old lobby more. The chat now seems crowded in between X other things and feels left with little to no space.
Also the size of buttons is more for totally new players/blind people; I don't feel it's necessary to have them so big. Plus they create a natural border - the list of games and formats and further to right from them feels just out of place and makes the whole lobby seem overcrowded with too many things.
New login screen; wow, nice pic
Not sure about having the login data [not] centered, but I guess I can get used to that.
I've noticed Guilds got additional column for "Ranking", any news on that?
And man, I'm missing a Volcanic Phoenix for my deck now
Also, is it just me or does the market (individual card profiles) take longer to load now?