Hah, can't exactly remember sadly.
As far as Yves\Eve goes, i don't think i've seen dev mentioning that name explanation will be exactly in her romantic route. I do remember it's something with deeper relationship, but that can be friendship or something.
Also, why do you think Rosa will be excluded from lesbian options? She's one of my favourite characters. Snatching her from husband will be very hot imo.
There wasn't much of definitive statements as far as i've seen (i'm here basically from first day), and i doubt dev will answer that because of spoilers. About Brooke's kiss... i've played bazillion games where it doesn't mean anything in terms of romancing. A shame, but a thing nonetheless. And most of lesbian content you ever see is some threesome with male, which i can't even count.