One of the quaint things about riding the Shinkansen is that people sometimes come by pushing a cart with food. I haven't ridden trains in the U.S., so it's possible that it happens here as well. The whole custom of doing so reminds me of old-style rail travel (especially in Europe/the U.K.) in which people used to eat food served in a similar style.
One thing which is not so old-fashioned is the idea of a Peanuts cart which sells Pocky - some of it in special packaging. It's a cute idea. I'm sure that the Pocky are the same as usual and that they can be purchased via other outlets, but it would be nifty to see one of these while actually on a shinkansen (bullet train).
The Pocky that is contained in the special Peanuts packages is largely the same flavors as standard Pocky issues. There's a "cookie crunch" version (on the right) which I hadn't seen before, but it doesn't sound like a particularly inspiring flavor. If you're a Peanuts fan, these are going to make a pretty cool collectible, though not as cool as the cart (which would be a lot harder to get your hands on).