http://www.mcdonalds.co.uk/ukhome/product_nutrition.dessertstreats.html
Sadly, methinks it will not come to pass.
From wiki:
In 1971 it became illegal to import haggis into the US from the UK due to a ban on food containing sheep lung, which constitutes 10 to 15% of the traditional recipe.[26] The situation was further complicated in 1989 when all UK beef and lamb was banned from importation to the US due to a BSE crisis.[26] In 2010 a spokeswoman for the US Department of Agriculture stated that they were reviewing the ban on beef and lamb products, but that the ban on food containing sheep lung would remain in force.
But not all bad news:
Following his victory in The Masters golf tournament in 1988, Scottish golfer Sandy Lyle served haggis at the annual Champions Dinner before the 1989 Masters.