The fact that they'll say when she goes into labour means, I think, that there will be some kind of announcement via Twitter/Instagram (if not the Buckingham Palace thing as I'm not sure how close to the throne you have to be for that one) fairly soon after baby is born. However, there will be no photos and no information about where Meghan, harry and Baby are.
I also think there will be a picture released via their own social media fairly soon - meghan looking immaculate but casual (think soft cashmere jumper or cotton button up shirt), sitting on a couch or bed, possibly with Harry doing the traditional "Dad hanging over the bed for the photo" thing.
Then the formal photo call a few days later.
It seems pretty clear to me that the point of this announcement was to make it clear to everyone that if you (or the media) had hoped to be camping outside a hospital then seeing them exit after a certain amount of time, it's not going to happen. Realistically however, if they want to keep the destination secret, I am thinking they are going to do their best for a a home birth as I can't imagine that there won't be some eagle eyed nurse or porter or doctor working in a different department who notices the security etc (I think the staff in the maternity team are probably fairly discreet but hospitals have a lot of other people floating around too).
And if they do a hospital, I think what this announcement is making clear is that they won't be coming out of the hospital's front doors and taking pics. They'll be coming out privately via underground garage or even one of those big tent things (like Kate had at the hotel for the wedding).
From my perspective, I say YES. I totally understand why Kate did the steps thing and have absolutely no criticism of her for it. But I think it's absolutely bonkers and I don't blame Meghan and Harry for thinking "No bloody way!"