The only "hidden message" I could even decipher in the logo is the "20". I won't be getting too far with that one theory only.
If they're going to celebrate the 20th anniv. of "Soul Calibur", that first game released in 1998 and add 20 to that, you get 2018? 'Don't think that's too feasible.
Soul Edge, the start of the entire legend, however, came out in 1995; add a 20 to that and you get 2015.
The last thing we were handed from PS was that SC:LS business, but that was released in 2014. Someone could have started to conjure up something since 2015 (maybe); so what would the company hypothetically have been doing that certain people on this website never knew about?