Who has seen the Lionel Polar Express set due to be released in time for the 2012 holiday season? Some forumites say they saw Lionel displaying it at York last month. For those who saw it -- is it headed by a diesel loco or a stem loco? If steam, how similar is that loco to the original Polar Express loc. I'm talking about the new Polar Express rtr freight set - not the Polar Railroad set.