Excerpt from Dekanta.com:

An almost legendary bottle, made for release at the Peninsula Hotel, Tokyo – one of the world’s greatest hotels. The exact source of this whisky is not mentioned on the bottle, and the hotel apparently prefers to keep people guessing. Reliable sources however, reveal that it tastes most similar to Yamazaki and Hakushu 30 Years old, perhaps, with something added into it. Quite exciting.