Wireless Speed allows a sensor to transmit the bicycles speed without a cable to the computer.
Some computers come with built-in altimeters, which will display the current altitude. GPS enabled computers can often do this more accurately.
GPS, or Global Positioning System, is a satellite based system that provides accurate location and altitude information.
Temperature monitoring allows for a computer to tell you the current temperature.
Some cycling computers can display a power reading, usually in watts. They usually require a separate sensor - in some cases a special hub or crank arm. A few will estimate the value based on speed, cadence, rider weight or other data. "Optional" means it can read from a separate power meter or sensor. "Included" means it is calculated by the computer or includes the neccessary sensor.
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