Apple will unveil two new iPhone models within the next few weeks, a low-cost iPhone 4 with design tweaks and a brand new iPhone 5. The news has been repeated ad nauseam, however this time around, 9to5Mac brings with it a new twist: the latter and more highly anticipated of the two models may be facing production issues. An iPhone 5 with a new teardrop design and a larger display is seeing production delays on at least one assembly line according to the report. As a result, 9to5Mac speculates that the the new iPhone 5 “will be delayed slightly at the very least and may see shortages all the way into 2012.” Apple’s new cheaper iPhone 4 will apparently be ready to rock in the coming weeks, however. The reports states that Apple will have over 10 million units on hand for launch, and the phones will be priced aggressively. Both the iPhone 5 and the new iPhone 4 are still scheduled to launch on October 7th, the report claims, aligning with earlier rumors.