Optional dice roll for stats is a confirmed upcoming feature, according to Swen Vincke.
I personally think it's garbage, exactly like "random roll for HP at level up", but more power to people who want to use this stuff, I guess.
I really hope they'll change their stupid system.
Why the hell can't I have 18 in any abilities and why am I stuck at 8......
Let me choose and let me roll.
That's... the standard 5th edition system?
Stats (pardon, "abilities") without racial modifications are capped at 15, even if you roll for them. And then they can be increased to a max of 20 over time levelling up.