Exactly when will Telltale release PA2?
 

In what timezone and when will they release PA2? I will probably stay up all night for it, but I just want to know what to expect.

Telltale never gives a specific release hour.
They are in the Pacific time zone (GMT-8) and usually release their games during business hours (9 AM to 6 PM, or something like that).
So, June 30 between 9 AM and 6 PM PDT is probably as good an estimate as you will get.

Usually the games are released in the first half of that window, but it varies if something (negatively) surprising happens.

That's the best timing for me :D (For me : 6PM-3AM)

So any time between 5pm to 2am British time.

It'll also release in the US App Store in about 10 minutes!

where did you get that information?

Based on TTG previous launch experiences it will be released in about 18 hours get some sleep.