The one pictured from the iPhone is PenTile RG/BG (actual orientation 45 degrees vs. the photo), whereas many large OLED tablets today use full RGB. Is this speculation that the iPad will be PenTile, or more of a quick match by ecosystem rather than product type?

Hope so... I was all set to get a 12.9" iPad pro but the current pro mini-led gives me eye strain.  I just cant handle the display for long periods.  The 11" side lit led is fine as are the 12.4/14.6 samsung galaxy tablets with oled.  Its just the mini-led.  Im guessing its all the mini-leds pointing directly at the viewer instead of side lit on the 11".   Self lit pixel on oled don't give me any problems.     I won't buy a mini-led ipad though which was sad as thats what I wanted before I spent time with it.