Narakir: Did you meant the tree ("expansion") packs you've to buy in order to have the complete game called Starcraft 2 ?
Because you are young and foolish, lieutenant, I will pardon that insult... But seriously - they told us all @ Blizzcon: "We want to make three epic campaigns, guys. There are three way we can go about this:
1* We can do all of them and release the product afterwards"
The people were thinking: "No effing way ! That would take ages D: !"
"2* We can make 3 different but a lot shorter campaigns and release the game faster..."
The crowd: "We've waited YEARS for this game - it should be worth it !"
"3* We can split it into three pieces."
And the crowd sighed in relief.
The basic idea was that the only additional thing the two later games ("Heart of the Swarm" and "Legacy of the Void") would give us are two massive campaigns. They may as well give us new features, but that's undecided as of yet. I guess they'd be tempted to add something to make the game even better... and you can't blame them.
Also - if you're calling these "free (?!) expansion packs"... you clearly have no idea WTF you're talking about. Wings of Liberty gives you more missions than all three campaigns in the original StarCraft combined, not-entirely-linear gameplay, mindblowing cutscenes, adventure-game-alike walking around the Hyperion/Mar Sara bar/whatever, talking to all the residents/guests, changing the music in the jukebox, watching TV flicks, an armory where you choose upgrades for the upcoming missions, star map for making strategic choices, the game itself, a few bonus Protoss missions, offline single player for broadband-impaired, multiplayer mode (with pseudo-LAN for those who need it), free BattleNet with all the voice-chat, replay-recording, news feeds, advanced matchmaking, lots of leagues, training maps, achievements, challenge maps and the unsurpassed pleasure to be Jim Raynor himself.
And you know what ? The other two games will not just be played with different races. Every_damn_thing will be different. It's not about making a crapload of new maps - as hard as it is - it's about showing us the story form a different perspective, a lot of new renders, clickables, characters, objects... Hell knows what !
While I'm around - be sure to have a ton of evidence and most of all - a deep understanding of the subject at hand if you ever wish to insult either Google, Blizzard or GOG...
Gundato: Seriously, do you think that GoG gave us all Tex Murphy for free because they are kind-hearted souls who like us?
I do. We like them back, so it's not really a problem of a one-sided feeling ^^'...