Updated from March 6th to include information in the sixth paragraph.

NEW YORK (TheStreet) -- The Apple Watch is Apple's(AAPL) - Get Report first new piece of hardware since the iPad was introduced in 2010. While some details about it are already known, sales numbers and revenues for the Watch figure to be some of the biggest unknowns in Apple's history.

Pricing is one key variable that has many on Wall Street guessing right now. Apple has said the Apple Watch will start at $349, with many expecting that to be price for the Apple Watch Sport, geared towards fitness enthusiasts. The other versions, the Apple Watch and the Apple Watch Edition, are likely to price higher, but given the wide range of estimates regarding how much higher, it's still unclear what that will mean for Apple's bottom line.

Deutsche Bank analyst Sherri Scribner expects Apple to ship 17.6 million Apple Watches this year, with an average selling price of $350. By 2018, she expects Watch-related revenue to be $28 billion, which would boost Apple's earnings between $1 and $1.50 a share. "While we remain positive on the Watch, we see the segment as a limited growth driver for Apple over the next few years and view current valuations as fair," Scribner wrote in a research note. Deutsche Bank rates Apple a hold with a $110 price target.

What the Apple Watch can actually do is still a bit of an unknown, despite CEO Timothy D. Cook having shown it off at the event in September, and despite an enormous ongoing marketing campaign highlighted by a 12 page spread in Vogue.

In addition to showing off its health and fitness applications, Cook demonstrated multiple new ways for Apple Watch wearers to communicate with each other, including by sketching with your fingers, tapping on the watch face, or even sending someone your heartbeat.

The Apple Watch will support Apple Pay, Apple's mobile payments offering, pushing mobile payments even further into the mainstream. "The launch of Apple Watch marks the first major combination of wearable technology with mobile payments, further demonstrating the company's confidence in consumer readiness for mainstream mobile payments," said Dan Wagner,founder and CEO of Powa Technologies.

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"I think the Apple Watch itself is going to move the needle in the long term for the company and the stock, but not initially," said Ironfire Capital portfolio manager and Real Money contributor Eric Jackson. "I think the product will be key to a bunch of stuff Apple does in the future."

There may be more to show off on Monday, as the Watch Cook displayed in September still seemed to be in the testing stages, according to BTIG analyst Walt Piecyk, whose firm rates Apple a buy with a $150 price target. "The product seemed glitchy to me when they revealed it with the iPhone 6." 

The Wall Street Journal recently reported that the initial first-quarter production run for the Apple Watch would be between 5 million and 6 million units. Half of that number will be the entry-level, $349 Apple Watch model. One-third of production would be of the mid-tier version, with higher-end versions accounting for the remaining sixth.

Aside from the Watch, we may see new MacBooks unveiled Monday.

Apple last updated the MacBook Air in April 2014, when it upgraded the processors inside using new Intel(INTC) - Get Report Haswell chips. In addition to the updated chip sets, Apple cut the starting price of the MacBook Air to $899.

However, a report from The Wall Street Journal suggested that the new MacBook Airs (which now come in 11- and 13-inch models) would debut later this year, shipping in the second quarter, and would include a new 12-inch version with a higher resolution screen. Many Apple enthusiasts have called for the company to bring its Retina Display screens to the MacBook Air. Currently, only the MacBook Pro and the iMac with Retina 5K Display offer the higher resolution screens.