Bigger iPhone 6 coming; iPad Mini Retina delayed, Citi says

A big-screen iPhone 6 should show up next year while the highly anticipated iPad Mini Retina may be delayed until the fourth quarter, according to Citi Research.

In a research note to investors Friday, Citi began by saying that production of the upcomingiPhone 5S "has been delayed by two to four weeks."

The note continued. "And while this does not preclude a September iPhone 5S launch date, we suspect volumes in September may consequently be challenged," Citi's Glen Yeung wrote, citing "our field work in the hardware supply chain."

At the end of the iPhone 5S analysis, Yeung punctuated it with this: "We...expect a 4.8 [inch] screen iPhone 6 to be launched in 1Q14" (the first quarter of 2014).

The iPhone 5 has a 4-inch screen while the Galaxy S4 from Samsung, Apple's biggest rival, sports a 5-inch screen. So, a 4.8-inch iPhone 6 would, theoretically at least, compete with large-screen phones like the S4.

Citi had a lot more to say about future versions of the iPad Mini. Namely, that it expects a $230-$250 iPad Mini followed by the delayed Retina model that's expected to have a pixel density of 2,048x1,536.

And Citi had this to say about the iPad 5, the next version of Apple's 9.7-inch tablet

With respect to the iPad Mini, NPD DisplaySearch said in May that production of the Retina displays for the device should begin by July with production of the tablet itself in the third quarter.

But a report this week claimed that production of the second-generation iPad Mini may be pushed back to November.

Apple's 24th annual developers gathering, the Worldwide Developers Conference, next week.