An analyst predicts the budget LCD iPhone will be delayed until October.
The delay would be caused by production problems with the backlighting chips, which will be used for a more bezel-less experience, even with an LCD display.
Analyst Katy Huberty says:
We currently see no delay in the ramp of Apple's upcoming flagship 5.8" or 6.5" OLED iPhones. However suspected issues with LED backlight leakage have caused a 1 month delay in mass production of the 6.1" LCD iPhone, although this is down from a 6-week delay baked into the original production forecast, according to suppliers.
The OLED models will be available in September, luckily.