DVC is real estate and would be put into a will in a similar way as any other real estate you own. Nevertheless, you should consider having this done by a lawyer. Some reasons for that:
1. Assuming you bought the timeshare together, your deed most likely says that both of you own the timeshare as husband and wife. That means the property is in joint ownership with right of survivorship. If one dies, what is in the will has no real application at the time. Under the law, the surviving spouse automatically becomes the full owner of the property and the property is not subject to any distribution in the deceased's will and is not subject to probate. Note that is a usual situation with any real property, including a home, owned by a married couple who purchased the property together.
2. The issue is thus what is needed if both die at the same time or what happens when the surviving spouse dies. That is when the property becomes subject to what may be in a will or other document, such as a living trust, controlling distribution. In other words, the main consideration for putting the property in a will is who gets it after both spouses die, such as children. If there is more than one child, you also have the problem of which one gets it because any particular contract that you purchased from Disney cannot be divided for any distribution. In other words, if you have two children, you cannot give half to one child and half to another; you either must give it to both as joint owners or give it to only one.
3. When that second spouse dies, the property becomes subject to probate. The problem with any real estate is that any probate procedure for the property must be brought in the state where the property is, meaning Florida for any WDW timeshare. In the words, if, for example, the deceased owner lived in in New York, you will need the generally applicable probate proceeding in New York, and pay separately for another probate proceeding in Florida for the timeshare where the estate will likely need to hire a lawyer in Florida.
4. That leads to considering what you really want to happen after the surviving spouse dies. Having a will to cover it is one issue but avoiding probate may be another. That leads to the consideration of whether you should create what is called a living trust applicable to everything that will be distributed upon death of the owners. The living trust is created to define distribution of just about everything the married couple owns, similar to a will, but it also creates a legal entity for ownership of any property, the trust, and once it is created, ownership of any real estate is transferred via deed to the trust entity. The will that is created mainly just cites to the living trust and usually sends anything that might not already be controlled by the living trust at time of death to the living trust. What then occurs is that all real property, including the timeshares is not subject to any probate, because ownership has previously been transferred to the living trust, an entity that is considered still "living" at time of the surviving spouse's death, and the property is distributed according to the terms of the living trust.
Bottom-line is that you may have a lot more to think about than just creating a will, and legal help on the issue is something you should consider.