I'm considering subscribing to the photography package. Will it be necessary for me to uninstall Photoshop CS6, or can I leave it installed on my computer? I understand that I will have to uninstall Lightroom 5 and install it from the CC application manager. But do I have to do the same for Photoshop?
Your license apps will be converted to the cloud license.
CS6 will get some bonus updates. No need to uninstall it. In fact it's always wise to keep around an earlier version in case you run into an issue with CC 2014. You may also install the previous version, CC.
Don't forget Bridge CC, it's a separate download and Extension Manager CC.