I think that is a corruption background, and he's throwing something at ebenstone that makes it stone.
new armor and accessories, blue stone layer(?), new gun, new flail, holy water, new spear(?), new sword.
-snip-
New armor looks badass.To me it looks like a drill, a saw and an epic hammer. I wonder what the boots do, and if the computer thing is just the depth meter or what... the snorkel and the shield too...Hot damn, yesss.
IMO I think their reskining some stuff in the game and yes I know it shows off some other new stuff just I think it's just a reskin
this looks like reskin, the way it's made doesn't look terraria-like imo