Per the playtest. "The entity is a voice in the shadows — its identity unclear".
That's still be a powerful entity. They just don't reveal themselves until they have you in their grasp. (Too many hexblade dips taught them not to reveal themselves too soon

)
It might be fun to wait till you hit level 3, and then roll a d4 to see what kind patron you got.
You made a deal, but was it with an angle or devil?
Also, it allows for "wide spectrum of Fey". So you can optionally accumulate power as you make more and more contracts.