I interviewed Matt Ashba at York for the S Gaugian. He is Lionel's Director of Product Planning for all of Lionel including S. Part of that interview was about the Polar express coming out this year and the Nickel Plate freight set and C&O passenger set pulled by the Berkshire now coming out in 2015.
Anyone ordering these sets should know these are "Ready-to-Run" products and are not designed for the normal collector and operator. The tender is plastic with plastic trucks while the locomotive is Die-Cast. This is ment to be an interductory product for youngsters or people new to the hobby. At $399 it is the same price as the O gauge "Ready -To-Run" Polar Express that is in the Lionel 2014 Ready to Run Catalog. If you read on page 18 of their 2014 Signature catalog their scale Polar Express with Legacy sells for $1,499.
The Flyonel version comes with the Flyerchief remote control system which is much like the Lionchief system. I used it at York and it is simple and easy plus it works just as described.
People need to read the catalog carefully so they don't misunderstand what they are buying. These engines will be scale to size but not scale appointed like the recent steam engines.
If Lionel chooses to make a scale appointed Berkshire with Legacy, like the Y3 or Challenger, look for them to cost $1,000