Yesterday, there were reports that the device will be released on May 31. However, that information was based on incorrect translation of an LG Social post. So after all LG upcoming flagship will be released on April 29! Good news for every LG fans.
According to LG,
May 31 is the end of the promotion (read about it here), not the shipping date of G4. Reservations are being accepted now and Korean customers will be able to pick up their G4s on April 29
The device is set to be unveiled on April 28 at two parallel events in London and New York.