Where's the movie set?
The Yukon and Japan.
How did Hugh Jackman get so jacked?
He talked with The Rock.
What power does Silver Samurai have?
As far as we can tell in this movie: Silver Samurai isn't a mutant. In the comics he is a mutant and can generate a tachyon field around any object, like his sword. He wears a silver suit of armor, but it's not robotic, it's not that gigantic. And the sword can't cut through adamantium.
In the movie: Silver Samurai is a robotic suit of armor. The blade appears to be super fucking heated and can cut through the strongest metal in existence. Which is stupid to me, but whatever.
Are Mariko and Yukio sisters?
No. Well. Sort of. Yukio was a street urchin. The Shingen family took her in to be a companion for Mariko. So they grew up together. But they're not blood sisters.
How do they steal Logan's powers?
It's the insect thing on his heart. What that thing is doing? Noooooooo idea. We don't know enough about how Logan's healing powers work or about how that creature works. It's flimsy, but we're supposed to suspend disbelief.