Apple Inc (AAPL) is set to release its FY Q4 earnings or fourth fiscal quarter results immediately after the stock market will close on Oct. 28. The Q4 earnings report is expected to cover Apple Inc's operations from July through Sept. 2013. All eyes will be on the record-breaking sales performance of the iPhone 5S and iPhone 5C.

Like previous quarterly earnings reports, Apple Inc (AAPL) will hold a conference call to discuss quarterly earnings results at 2pm PT or 5pm ET. In the company's Q3 call, Apple Inc reported earnings of $6.9 billion based on iPhone sales of $31.2 million, $14.6 million on iPads and Mac sales of $3.8 million.

Apple Inc earned $35.4 billion in total revenue for the third quarter of FY 2013. The Q4 call will likely provide Apple investors and tech observers details of how the new iPhones fared in the market. The iPhone 5S and iPhone 5C sold 9 million units in the first three days since stores first put them on shelves.

Apple investors may also be excited to see how the iPhone 5S and the iPhone 5C has affected Apple's bottom line. However, analysts have taken note that Apple Inc's new iPhones were only on sale during the last 10 days of the fourth quarter of its fiscal year. The true impact of the iPhone 5S and iPhone 5C may not be felt until Apple releases its first quarterly earnings report for fiscal year 2014.

Apple Inc (AAPL) is apparently motivated by the sales performance of its new iPhones. Following the launch of the iPhone 5S and iPhone 5C, the company has changed its earnings guidance to reflect upward movement. According to reports, Apple expected its earnings to reach between $34 and $37 billion. The company has also revised its guidance for gross margin and expects a decline at 36 or 37 per cent.

Fortune survey with mixed results

Fortune's quarterly survey of Apple analysts has resulted in mixed reactions. Out of 48 analysts surveyed, most agree that Apple Inc will report a revenue increase of 3 per cent in its FY 2013 Q4 call. A consensus has also been reached that the company will have a 6 per cent decline in earnings year over year.

Fortune surveyed 27 professionals and 21 amateurs. Amateur analysts showed they were more bulling on Apple's revenue and earnings per share due to their estimates of the iPhone's gross margins. In comparison, the pros are banking on Apple's iPad, iPod, Mac and iTunes.