I genuinely think they're going to be a different breed, I just don't know if they're actually going to be any better or worse than any previous generation. The worst case scenario is that they end up being borderline Theo-Kaczynskis.
There's a good chance they will be socially and emotionally stunted from prolonged repetitive usage of handheld devices, coupled with spending their formative years in isolation for a year and a half.
Online political polarization will completely eradicate any perception of nuance they otherwise would have had in a real social setting, they will be addicted to self gratification on the same level of a gambler, they'll equate their own worth to how many likes and comments and positive/negative affirmation they get on a post, because to them, the internet is apart of real life and is just as important as the world around us, and internet slang won't just be a form of slang anymore, they'll incorporate it all into their general vocabulary the same way you'd used idioms like "Any port in a storm", or "Hook, line and sinker".
I also think a rise in incelism/misanthropy is a genuine possibility as you can't raise a child in the world we live in now with this much blatant negativity and expect them to come out as balanced out regular folk, early-onset depression isn't at all unlikely.
Speaking of which ADHD and OCD-type behavior is supposedly on the rise with those who started using the internet + unmonitored access at younger, and younger ages.
Now, I don't expect all of this to come true, but I would be more surprised if none of it did.