I think this is an absolutely obvious scam, but judging by their Facebook page, it will sadly attract a lot of naive people who in my opinion all will lose their money.
As soon as I pointed that out they blocked me from posting on their FB page.

I think a warning should be pinned because their apparent pre-sale starts in two days.

Their white paper published today is an absolute joke, check it out here: plexcoin.com/whitepaper