I was prepared for something far heavier since the album had been advertized as such compared to the 2010's releases. Not gonna make any more assumptions until the album release so I don't disappoint myself from too much hype.
Who advertised the album as heavy?
Twenty years after White Pony and people are still getting hung up on "is it heavy?", as if they've never listened to Deftones before. Not having a go at you particularly, but a few people are going in with that question/expectation and they inevitably end up disappointed when it's not 'heavy' enough for them. Happens every album.
And eventually they go back and realise the record is great. See S/T and SNW. See even White Pony - there were fans who thought that record was too soft, didn't have enough screaming etc. Which is obviously mental but that's what having too many stylistic expectations can do.