They won't choose Helena as there's already a Helena Windsor. I can't see them using Diana as William already did that with Charlotte. Doria is a possibility as a middle name but it doesn't really "fit" if that makes sense.
I definitely think she'll have a girl, although I quite like Frederick or Arthur for a boy.
Re: the bump touching - its so very irritating and vain. Puts me right off her. I liked her outfit at Eugenie's wedding but she very deliberately opened these buttons when there wasn't anything to show. I also really liked her award ceremony black dress but again, most people would sit their hands under the bump.
In terms of style, I much prefer Kate's style and I'm more inclined to copy her than Meghan.
I think Lady Louise will be one to watch but I see her going down the more classic, traditional, smart route, than the eye catching, latest fashion route.