I'm not quite sure what the fascination is here with unusual promotional flavors. If you read my blog, of course you know about all the KitKat varieties. (And Nozomi found a VERY unusual new one today which I'll post later...)
So, friends/family from the States (or Australia or New Zealand or ...), has that become more popular there recently? I just can't imagine Pepsi making "New York Cheesecake" flavor (just an example, but who knows, it might show up here...) or anything similar in the US.