I clicked on buy cause i was curious and it was trying to charge my paypal(which i haven't set up for blizzard). So i cancelled and logged in. Went to log out to screen shot it and I dc'd. Now unable to log back in. It was definitely listed for $60 thou.
Some of the realms went up momentarily but looks like they all went back down and indeed I saw the Level 90 boost available in the shop for $60.00
Same thing DID happen to me - I was momentarily able to log in my server (Dath'Remar) - and the new "Shop" button (just above Addons) offered Boost to level 90 for $60.00. Sorry I didn't get a screenshot - but it really was there.
Interesting Note: it said it was a one time boost for one character - I don't recall the exact wording, but it seemed to imply that you can only use this boost once for one character (though I may have misread it).