There's a new listing for a release called Strawberry Hotel here:
https://www.hmv.co.jp/artist_Underwo...Hotel_15178707
It's an import from the UK and a CD, release date of Oct. 25. The catalog number (UWR00098CD) is the next in series (Denver Luna was UWR00097).
The pricing suggests it could be an album. And that the fact that it's listed as a CD (there hasn't been a commercial CD single since 2007). If it is an album, then the catalog number sequence suggests there wouldn't be any single releases before the album.