A new currency was introduced in the game - Honor. You can earn it by participating in the guild battles and Arenas.
The place where you can spend your collected Honor is a new guild shop Arsenal. To get to Arsenal just tap on the icon of the little tent at any screen in the guild menu or on the button "Arsenal" on the "My guild" screen.
Please note whole collected Honor will "burn" in 5 hours if you leave the guild, or if you are kicked out of it.