You're up for a surprise

I smelled something fishy too, then found some more videos of Turing and saw the same time there as well, so I thought "maybe some internal meeting where they made all these videos?" and even started writing a lenghy post about it here on TMO.

But then realized they all are showing the Tutorial app, so I opened it myself... And found out that the lock screen is from the Tutorial with the exact same date - 8 June. Try running the Tutorial for yourself

That being said, I am very cautious about the whole Turing thing, but the date issue has an explanation.