This week marks the 25th anniversary of Apple's first Mac laptop. So, what better time for an entirely new top-of-the-line Mac?

Apple introduced new 13-inch and 15-inch versions of the MacBook Pro that are thinner and lighter than their predecessors. The MacBook Pros have a new retina display that is supposed to be two-thirds brighter and more energy efficient, and they have a battery life of up to 10 hours.

The 15-inch MacBook Pro has an Intel i7 chip, while the 13-inch MacBook Pro can be configured with a dual-core i5/i7 processor. Both have four Thunderbolt 3 ports, which can be used as USB-C ports or as charging ports, and a headphone jack.

In other words, users will likely be needing some more adapters in their future — starting with the Lightning-to-standard headphone jack adapter that came with the iPhone 7.

All new models of the MacBook Pro, as rumored, have their function key row replaced with a long, single strip called the TouchBar, which changes depending on the program in use. The brightness, volume and other controls are still accessible from the bar when users hold down the function key. But if, for example, you're using Safari, you can have the TouchBar display your favorite websites. If you're in Mail, you can flag messages or move them by using buttons on the TouchBar.

Users can also customize the TouchBar to suit their needs.

The TouchBar also houses the MacBook Pro's fingerprint sensor, which has now been added to the company's laptops. If people share their computer, the laptop will automatically switch accounts once it recognizes the appropriate fingerprint.

The laptops will cost $1,799 for the 13-inch model and $2,399 for the 15-inch. Preorders open Thursday, and shipping starts in two to three weeks, Apple said.

The 13-inch MacBook Pro is smaller and lighter than Apple's previous ultra-portable, the MacBook Air. To that end, Apple is also introducing a new 13-inch version of the MacBook Pro with the traditional function keys for $1,499. That is available to order and ship Thursday.

Apple will continue to sell its 13-inch MacBook Air starting at $999.