There can be various reasons.
First of all, there's a commercial partnership between 2k and Ps4.
If you notice, in 2kTV Episodes, players use Ps4 pad (see latest, MKG, clearly holding a PS4 gamepad)
Second, they maybe wanted to test it first, then spread it.
And it's very probable it went this way, since yesterday patch came to pc, today announced it's submitted to Sony/Microsoft.
Next step (and very soon, I hope): release.