Roland are usually very secretive about their new products, and normally don't announce them before they have a model to show.
Unless there is some very concrete info about these new E100/E200 at the NAMM, I would have to assume that they are at this point a vaporware. The leaked news is a marketing ploy, intended to temporarily stem the tide of people switching from their aging Rolands to new Yamahas and Korgs.
Regards,
Alex
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Regards,
Alex