The shop is broken for me since at least today, maybe even earlier.
Win10.

Edit: I did nothing, and suddenly the shop is working again.

I had the same via Galaxy 2, Chrome and FireFox. Now it works. I guess it was a temporary glitch.

They are starting a new Store beta that will incorporate other platforms as well. Perhaps they were doing some updates to accommodate the closed beta to the normal store and then a bug happened. Well, whatever the reason, fixed now.