Final answer:
Post-traumatic embitterment disorder is the disorder that may be added to the DSM-5 but was not included in the DSM-IV-TR. Bipolar disorder and gender dysphoria (formerly gender identity disorder) are already in DSM-IV-TR, while neurosis has been dispersed into other diagnostic categories.
Step-by-step explanation:
The disorder that may be added to the DSM-5 but is not currently found in the DSM-IV-TR is post-traumatic embitterment disorder. In the DSM-IV-TR, disorders such as bipolar disorder and gender identity disorder (now referred to as gender dysphoria in the DSM-5) already exist. The term gender identity disorder has been controversial because it implies that there is something 'disordered' in the patient, so it was replaced with gender dysphoria in the DSM-5 to reduce this stigma while still allowing for necessary treatments. Neurosis is a category that is not used in the DSM-IV-TR under that name and was largely incorporated into other categories.