Yes it´s an all new "Fat Boy Lo" and it looks like the actual 2013 model. It will have the Twin Cam Engine. The old Fat Boy comes with the Evolution Engine.
If I read it right on the tamiya homepage, the cylinders comes as seperate parts fin by fin. Google made this translation from their homepage: a stacked assembly method the cylinder head and cylinder, 1584cc air-cooled V-twin engine as a center of attraction to reproduce sharp cooling fin chiseled.
I hope they take the chance, to make a first class model without the old phillips screws and put so much detail in it, like they do in every military scale model.
I´m looking forward to get the new Fat Boy Lo and hope they make a Black Line, Slim or a Wide Glide too.