In a manner similar to Windows 7's Sensor and Location Platform, Snow Leopard's CoreLocation framework will allow you to make your applications location aware. Since Macs do not (yet) include GPS technology, CoreLocation triangulates the position details from the networking hardware, similar to the original iPhone. When Snow Leopard is released, however, I'm sure Macs will come with a GPS unit by default.
Also included are a number of Cocoa-based programming interfaces that allow programmers to tap into the multitouch functionality provided by the touchpads in newer MacBooks and MacBook Pros. Whether or not this framework could also power display-based multitouch remains unknown, so there's no way of telling if Apple will include such technology in future Macs.
The information is gathered through the most recent Snow Leopard seeds. It is not yet known when Snow Leopard will hit the shelves.