While Apple is expected to launch two bigger iPhone models this year, including a 4.7-inch iPhone 6 model and a 5.5-inch iPhone 6 (or iPhone Air) phablet, a new research note obtained by MacRumors from well-connected Apple insider and KGI Securities analyst Ming Chi Kuo says that the latter model might hit stores next year. FROM EARLIER: New report claims to reveal release date for iPhone 6 and ‘iPhone Air’ This isn’t the first time reports have claimed the 5.5-inch iPhone 6 will be delayed, compared to 4.7-inch iPhone 6 launch plans, as Apple is facing production issues. While previous reports said that sapphire glass mass production will lead to 5.5-inch iPhone 6 delays, Kuo now describes new iPhone 6 manufacturing challenges. “Production