I have 7 grandchildren now and other than the car-seat that can be put on wheels instead of lifting a baby into a buggy, I haven't yet seen anything super-useful to be honest. Three different parenting styles, nothing much new.
Lots of the useful things I also had for my babies all those years ago, the cheap plug-in night light for the landing, the mouli-type grater for mashing up "real" food, the baby-sling (both soft and rucksack type on a frame for later), multi-use "muslin" type cloths, baby monitor so we could hear if they woke... I didn't use disposable nappies but neither have my daughters.
The "next to me" baby cot type thing was used by all of the grandchildren - but we had something similar so even that isn't exactly new.
The baby bath seat mentioned above was definitely liked by one of my daughters.