Shujinko is the character you play in the game's konquest mode, which is an RPG-like adventure with quests, inventory items, and plenty of one-on-one fighting. When you begin the mode, Shujinko is a 13-year-old boy who merely dreams of being one of the great fighters, like Liu Kang. But time flashes forward at key points in your quest. For example, once you get out of your starting town, you'll train with Bo'Rai Cho and time will jump ahead five years. Shujinko will age appropriately. By the end of the mode, which will supposedly take players 20 hours to complete, Shujinko will be an old man with the ability to bust out with a ton of special moves. The brief video shown at a Midway event in San Diego showed the old guy using Sub-Zero's ice, Scorpion's spear, Liu Kang's bicycle kick, and Raiden's torpedo. You'll be able to take Shujinko into the other modes in the game, including online. Aside from Noob-Smoke and Shujinko, other characters that aren't on the standard 12-man roster were displayed, like Sindel, Jax, and Kenshi.
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There, plain and simple, Jax is in. It also mentions Shu's new plethera of moves. It talks about Konquest and how time cuts some places to make game shorter. One thing to confuse me, is how does Shu know about Kang and how does he want to be like him if they werent alive at the same time?

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EDIT Midway also showed off a few new hara-kiri fatalities, which are suicide moves that you'll be able to do after losing a fight--if you can pull them off before your opponent pulls a fatality. Kabal takes his hooksword and jams it into his head and chest. Nightwolf tosses a tomahawk up into the air, where it spins around and lands blade-first in his chest. Other characters will rip their own heads off, bash their faces into the ground until their head comes off, and so on. Outstanding! On the fatality front, we caught a glimpse of how Kabal will cause his enemies to spin, then stick his hooksword into the spinning victims, causing them to essentially disintegrate into chunk. The fatalities and hara-kiri finishers are nicely gruesome, though they also convey Mortal Kombat's classic sense of humor extremely well.