Piggybacking on Mr 123457 thread with some observations. Will be updating it as I see new stuff.
1) Arid ruins is 1 fight now, and pretty hard. Rewards are better but not all. Some are still 2 soulstones, but you get 2 skill orbs instead of one, more HB and more Merits, etc. Hard to say how much better, because my Taiwan smurf is a newb
2) The shop shown uses some kind of reward-specific tokens which I have no idea where to get. But, some of them are gem based, and I tried to pay 200 for goblins, as in screen shot above. Got 3 extra builders for 1 hour.
3) New superpet and pet
4) New Expedition
First button was a sweep of three fights, then the rest of them were manual. Also, got fame as loot after winning 5 fights.
so far i've seen only 2 new skins ,they are for the new heroes
is this a mistake or whats comming for blitz gauntlet season 4?
Minor thing, but when hiring heroes with gems, this pops up.
Left button takes you to new shop that Mr 123457 showed in OP. I am going to guess hiring heroes from that shop with those tokens is equivalent to gem hires.
BTW, checked Warehouse shop, nothing new. Although, since Merit shop is random, there could be something new there.