starcraft-2
If I have the Heart of the Swarm extension pack installed with my StarCraft II, will the Wings of Liberty campaign be affected by it? (I.e. new terran units, new upgrades, etc?)
I don't mean for the plot to change (because that would obviously not change), but is there anything different between playing it with the extension pack and without?
If I'm understanding your question properly, in order to have two Heart of the Swarm licenses you need two Wings of Liberty licenses.
Since Heart of the Swarm is not a stand alone expansion, you need to have all the prerequisite games in order to play it (each copy).
You can see for example, on this Cataclysm box art for World of Warcraft, that it requires "Wrath of the Lich King to play". Wotlk says it requires TBC, and TBC requires the base game. It is expansions all the way down. This trend stands true for all Blizzard games to date, as they don't release stand alone expansions.
In the starcraft 2 lore panels at blizzcon 2010 and 2011 they answered these questions. The canonical choices are the A choices, so
Raynor chose Tosh over Nova
Raynor chose Dr. Hanson over Selendis
Raynor chose the Tunnels in Belly of the Beast, not the platforms in Shatter the Sky
Best I can find for the tunnels answer is the entire lore panel from 2011.
Best Answer
you have the new UI features (workers per mineral patch, change on the look of attack commands, etc.) since they got implemented in WoL too. However, I have not noticed any changes in the units as all the Terran units are Campaign only (marauder don't have stim, medics, banshees with splash, etc.)