SC Flier reported on milepoint that the Bentley Hotel in London is showing up as a Category 8 hotel. Hilton is infamous for inflating award charts and adding new categories every year or so. Currently the highest hotel category is Category 7 which can be redeemed for 50K in low season. Redemption at the Bentley requires 60K HHonors in low season and 80K in high season.
While this may be a mistake, I think this is just a harbinger for more bad news. I would definitely consider ditching Hilton if there is a category shift again!