Well.. Do be honest they will release the whitepaper a day before the pre-sale begins.

Also they stated: "In order to secure the first buyers, we have set a point of no return. If after the 29 days of pre-sale we did not reach this threshold, then all buyers will be fully repaid."

So 29 days.. But that's true, that they have no sponsor list, but if it turns out that they are legitimate, they can revolutionize the cryptocurrency usage as we know it.

I remain open minded but sceptical. You can write them an email(I did already, issuing a few concerns): info@plexcorps.com. They answered me within a day.

Also answered on facebook within 4 hours and on their webpage they answered within 10 minutes. The website chat.
They have alot of legitimacy sings but at the same time, absence of the whitepaper and super-high profit rate are alarming. As I mentioned, I will remain sceptical but open-minded.

MisterBiter