KGI Securities analyst Ming-Chi Kuo, who has provided accurate Apple product information in the past (timing aside), has released a new research note predicting that supply constraints on key components may result in a serious delay in the release of the larger iPhone 6 model with a 5.5-inch display. According to the note, issues with the in-cell touch panel and coloring of the device could push the launch of the device back to a post-October date, possibly as late as next year. The report goes on to note that the phone’s sapphire display (which we’ve seen recently in a scratch test video) may not prove sturdy enough in drop tests to go to market yet. Kuo recently noted that the upcoming iWatch, which will also use a sapphire crystal display, will enter mass production in November. Kuo predicts that when the larger iPhone 6 finally ships, fewer than 15-20 million units will be available.