Does anyone have any information on these "new" arrangers Roland is advertising in all the mags? How are they different from the EXR line?

I think they are pretty much identical.
Maybe the new EM series are sold by the Home Piano stores , while the MI stores sell the EXR line..

Fran,
You are exactly right. The EXR3 and EXR5 are the same keyboards but are sold by Roland MI dealers and the EM100 and 200 are sold through their CK dealers.
George Kaye
Kaye's Music Scene
Reseda, California