Great mod, played it last year, DM'd it tonight.
Fairly straight forward, 1 combat encounter, 1 environmental encounter. Pressing the players for time is essential, but if they wanna take a long rest, let them, it just means more dwarves are killed. For the combat encounter, I had an barely average party take on a remorhaz. Welcome to Tier 2! With this mod, I feel you can throw an extra potent mob at the players, and use up resources because combat in the final, plot driven encounter should be discouraged.
The rescue encounter can be solved very easily with a druid/ranger spell (which, when I played, our druid got off first thing, and the infiltration was a cake walk) but when I DMd it, the PC druid did not have it memorized. They elected to go up, climb down, and infiltrate. They then got locked into some frivleous plans about distracting the horde of ogres, and one PC was bound and determined to cause a distraction, and then wanted to run through the camp while thunderwaving everything. That cheapens the threat, turns the danger of an armed camp full of lethal foes into a joke. I don't recommend that you, as a DM, allow that to happen without serious repercussions.
Part of this problem, I think, is that the players can spool the plan out into complete absurdity, like trying to use Prestidigitation to try and distract an entire camp of bloodthirsty ogres laying siege to a place, because they don't have a better idea. It also wastes a significant amount of time while the players spin their wheels. Use the NPC dwarves to point out some logical flaws. If you are pressed for time in the AL environment, try to encourage them to find a solution that will A) not waste any further time, and B) not lead them to their obvious and inevitable deaths. Combat is probably the worst option and if you have players bent on having combat with the ogre forces, you should pulverize them. Ice Spire Ogres are very potent, and there should be little to no chance of success against the entire camp.
Tier 2 for Storm King's Thunder is fantastic, with some really scary monsters for players to fight. It's my favorite season, and this module sets the tone for things to come. Highly recommended, but be prepared to put the hammer down.