The iPhone 5S may be hitting shelves a little later than expected, if Citibank analyst Glen Yeung’s prediction has any weight to it.

Originally forecast for June, the iPhone 5 upgrade will stay off the market until roughly August, Yeung claims.

"With input from Citi's Taiwan-based technology research team ... we now believe that a further 1- to 2-month delay (from July to August or September) is possible, likely stemming from volume production issues,” Yeung said in a research note.

CNET says that the much anticipated iPhone 6 may not even be seen until after 2013. That phone is rumored to have a larger screen.

But MacBook Air fans got some good news, as the report says that a new high-resolution retina display is in a new version of the notebook.

If this is true, most of Apple’s laptop computers will have retina display. Currently, only the 13-inch and 15-inch MacBook Pro have it.

As for iPads and iPad Minis, Yeung does not seem to enthusiastic.

"We remain concerned about iPad Mini demand in light of flattening production in 3Q13 (third quarter 2013) ... potentially two models in 4Q13: Retina Mini 2 and non-Retina Mini 2,” he said in the research note.

Apple is expected to show an 18-percent decline in second quarter earnings on Tuesday, losing $10.02 per share. The company started the week on Monday trading at $392.65. It was almost double that when Apple hit an all-time high on September 21, 2012 with $705.07.

"We remain in the minority by NOT recommending Apple," Yeung wrote.

Just last week, Tech Radar speculated that the iPhone 5S would be pushed back or skipped altogether, in favor of the iPhone 6, although Tech Radar admitted that the latter was unlikely.

As with the 4S, the 5S is not expected to change too many things about the phone itself, besides upgrading the camera and having a faster processor.

The iPhone 5S has potential to get Apple back on its feet by allowing a wider variety of phones to be purchased.