Wall Street is projecting Apple iPhone 6s and 6s Plus quarter sales will far exceed the "Herculean-like" showing of the iPhone 6 over last year's same December quarter.

According to News Investor, "based on Apple store checks, pre-order data and China market analysis," the company will sale some 77 million units over the quarter this year compared to 74.5 million in 2014.

In addition, the company sold out of its entire inventory for the iPhone 6s series during presales, almost guaranteeing that lines would be long and traffic consistent once the models officially arrived at stores on Friday.

The latest models feature a set of subtle but distinct changes from last year's offerings, chief among them are a highly sensitive display case, advanced camera options and an overall quicker processor.

The iPhone 6s and iPhone 6s Plus each come in four colors (silver, gold, space gray and rose gold) and three data storage configurations (16GB, 64 GB and 128 GB) and start at $649 and $749, respectively. Apple and several other wireless carriers also are offering monthly installment billing plans.

Overall, Goldman Sachs is forecasting 6 percent growth on iPhone revenue for fiscal 2016 and FBR analyst Daniel Ives added that demand for the new sets looks "robust."

Over the opening weekend, The Guardian reported eager buyers from Sydney to New York lined stores in search of their favorite trims and colors. At the Apple Store in Soho, just before noon lines still stretched around the corner and spanned an entire block on nearby Greene Street.

Analysts have indicated they anticipate up to 13 million of the phones to sale over the first weekend, significantly up from the 10 million in 2014 when the launch of the iPhone 6 was delayed in China.