Just a few things that the guides may or may not have told you...
Bring some really good "perishable" food for the 1st day or 2. Your going to be eating freeze dried bags of crap for close to a month, so the less days the better... Next time I go I am stepping off of that glacier plane with a large sausage and onion pizza and a big bottle of Pepsi!
I also recommend bringing one or 2 lbs of sweets to consume thru out your trip. They are good to eat for dessert or as snacks, and are a nice alternative to all the freeze dried... Also bring plenty of powdered Gatorade or something else to flavor the water. Your going to be drinking melted snow for close to a month and that gets quite old after the 1st day.
I'd also recommend bringing an Ipod (with a battery charger) , a good "thick" book, a journal, some pictures of your loved ones, and a deck of cards. Your going to be spending many days resting in your tent and time goes by SLOW...
Also, leave all modesty behind when it comes to using the bathroom. There are a few pit toilets at Base Camp on the Kahiltna, and at 14K camp, but most are nothing more than a wooden box built over a hole, with very few or no sides, and they are right out in the open.
But don't worry about having to take a dump in public, we all have to do it...
In between Base Camp and 14K Camp you have issued community bags to share and deposit into crevasses. Above 14K there are no more pit toilets, but they issue a plastic bucket with a screw on lid for each team to share. These need to be brought all the way back down, and what's worse than having to share it, is when it's your turn to carry it...
Be safe and have a blast! Your going on a trip of a lifetime, and when you have a bad day or 2, or 3, try not to get discouraged, just keep thinking about the big picture, the whole trip...
Looking forward to seeing your pictures!