Google testing JUMBO checkout icons.
Desperate for money ? or desperate for checkout signups ? probably both.
This is what the checkout icon normally looks like (can you spot it?):
Cheers,
— amr
PS: Also notice the “California” line under the second ad on the right, I am guessing that indicates it is a California targeted ad (I am in California). Did they have that for some time or is it new? (does not seem to be a test).