You'll be staying in the THV on the 2013
point charts.
DVC reallocated the SSR
point chart a little for 2013, making the THV more points than a standard 2-bedroom. For that reason, it will be difficult to predict, right now, what the demand will be like. (In 2012, it was the exact number of points to get the THV as it was to get a 2-bedroom. The THV were very popular, yet not impossible to book at 7 months. The change in points will certainly change the mix of who wants to stay there, and it may become a little easier to get one.)
Bill is correct, though, if you need handicap access, there are only a small percentage of rooms that have a ramp. The other units all have a flight of stairs to get to the front door.
Our family absolutely love the THV, but they're not for everyone. They have pros and cons. (In some cases, what's a pro for one family may be a con for another.) For example, we love the fact that it's an isolated section of the resort set back under a canopy of trees. It gives it a very restful atmosphere and you absolutely don't feel like you're in the hustle and bustle of WDW. We don't mind the fact that this remoteness makes transportation a little more complex. Others find these two attributes to be a down side -- the rooms are very remote from the main pools, restaurants and shops, and the buses to the parks are more complicated.
The rooms themselves also have some differences. As I already mentioned, there is the issue that you have to walk up a flight of steps (or a ramp) to get to the room. This is especially fun when you're moving in or out with luggage or bringing in the groceries.
The THV sleep almost the same number of guests as a standard two-bedroom at SSR, but have a different configuration. The dedicated two-bedroom has a king-sized bed in the master, two queen-sized beds in the 2nd bedroom, and a queen-sized sofa bed in the living room. The THV has a queen-sized bed in the master, one queen-sized bed in the 2nd bedroom, a twin-sized bunk bed in the 3rd bedroom, and a queen-sized couch and twin-sized sleeper chair in the living room. (I'm not sure if SSR has added a sleeper chair to the 3-bedroom yet. I don't think so, but it's been a while since we've been in a 2-bedroom.) The two biggest differences are the lack of a king-sized bed in the THV master, and the bunks instead of one of the queen-sized beds. If you've got a group of all adult-sized people, it becomes an exercise in "who
has to sleep in the bunk beds." (With kids, it's an argument over "who
gets to sleep in the bunk bed.) While the THV offers more privacy with 3 bedrooms, it has less square footage than the 2-bedroom units. Some of the rooms (like the 2nd bedroom and bunk room) feel downright tiny. The kitchen/living room/dining room area is big and open, though.
As Bill mentioned, the THV are built in a wetland (also known as a swamp). The area is absolutely beautiful, but you may notice a few critters. Bugs haven't been too bad the several times we've stayed there, but you should definitely pack some OFF. Also, the paths are all well lit, but if you're not used to being in the woods, it can be a little spooky at night.
As I alluded to above, there is no direct theme park bus service to the THV section of the resort. You need to take one bus to the main resort, then change buses to get to the park. (There is also boat service or a walking path if you prefer that to the bus transfer.) If you have someone in a wheelchair, this bus change can be especially time consuming. We typically walked to the Grandstand bus stop instead of taking the internal bus. (The THVs are really more suited to those who drive or rent a car, but Disney transportation isn't unworkable.)
We love to cook out when we're in a THV. Every unit has its own BBQ grill. If you plan to do this, pack a flashlight. It's rather dark at the grill (the lights are on the opposite side of the path for some reason).
There are many posts discussing the THV, including some very detailed trip reports. You can use the DISboards search feature or Google to find them.
. 
Bill
