Good Morning, amusedtodeath -
Congratulations on the purchase of your new MacBook Pro! Your current Mini DisplayPort to DVI cable should work with the Thunderbolt port on your new Mac. Take a look at these resources for using an external display:
Apple Mini DisplayPort adapters: Frequently asked questions (FAQ) - Apple Support
https://support.apple.com/en-us/HT204149
Some Apple computer have a Thunderbolt port instead of a Mini DisplayPort. Computers with a Thunderbolt port will have the following symbol next a port although the port physically appears the same as a Mini DisplayPort:
Thunderbolt ports:
- Are compatible with all of the Mini DisplayPort adapters referenced below in question 5 and with Apple Mini DisplayPort equipped displays.
- Support adapters like Apple's Thunderbolt to Gigabit Ethernet Adapter and Thunderbolt to FireWire Adapter which are not otherwise compatible with Mini DisplayPorts.
See Thunderbolt ports and displays: Frequently asked questions (FAQ) for more information on Thunderbolt.
OS X Yosemite: Use your TV as a display
https://support.apple.com/kb/PH19036?locale=en_SA&viewlocale=en_US
Configure - Apple Store (U.S.)
http://store.apple.com/us/buy-mac/macbook-pro?product=MF839LL/A&step=cto_accesso ries
Apple Thunderbolt to Gigabit Ethernet Adapter + $29.00
Apple Thunderbolt to FireWire Adapter + $29.00
Mini DisplayPort to VGA Adapter + $29.00
Mini DisplayPort to DVI Adapter + $29.00
Mini DisplayPort to Dual-Link DVI Adapter + $99.00
MagSafe to MagSafe 2 Converter + $9.99
Apple Thunderbolt Cable (0.5 m) - White + $29.00
Apple Thunderbolt Cable (2.0 m) - White + $39.00
Apple Thunderbolt Cable (0.5 m) - Black + $29.00
Apple Thunderbolt Cable (2.0 m) - Black + $39.00
Enjoy!