A demo is expected to be released very soon for The Wonderful 101 Remastered.
What happens is that “The Wonderful 101: Remastered Wonder-Size Cadet Demo” was added to the PSN database and detected by the bot that checks this (below).
With this addition, the demo will arrive at some point. It is likely to be this week, but it may happen to be released much later. An official announcement from PlatinumGames on the subject would clear things up, which may happen soon.
The Wonderful 101 Remastered is available for PS4, Switch, and PC.