Basically it's as close to a full bush as the 20-somethings are comfortable with, having matured in the age of pubic hairlessness. In fact, many have been waxing it all off since they were in their late teens, so this "let it (almost) all grow out" trend might be seen as a rebellious return to nature for the children of the internet porn generation.
Can this full bush Brazilian REALLY be the new thing, you ask? Even American Apparel mannequins are are sporting merkins now (see picture), so yes, yes it can. More and more of my clients are requesting it, and you can too. Just ask for it by name at your next waxing appointment; "full bush Brazilian, please!"