by Gadgetx
Correct, It is just a reprint of the standard edition with the smaller board.To quote the site "This edition includes a new box artwork, new cards design, new player boards, a redesigned game board, new meeples, new panorama cards, etc."
You can find more about the 5th anniversary edition at the link below.
https://boardgamegeek.com/thread/1834181/tokaido-5th-anniver...
It is mostly a change of artwork. For me, I don't care about it. I'm very happy with the deluxe edition and I have the new minis on pre-order for whenever they finely release. The minis really bring something to the game.