The United Nations Committee on the Rights of Persons with Disabilities has adopted its General Comment No. 6 on equality and non-discrimination.
http://tbinternet.ohchr.org/Treaties/CRPD/Shared%20Documents/1_Global/CRPD_C_GC_6_8649_E.docx
It includes one reference to autistic persons:
"33. Regarding the consultation obligations of States parties, article 4 (3) and article 33 (3) of the Convention emphasize the important role that organizations of persons with disabilities must play in the implementation and monitoring of the Convention. States parties must ensure that they consult closely and actively involve such organizations which represent the vast diversity in society, including children, autistic persons, persons with a genetic or neurological condition, persons with rare and chronic diseases, persons with albinism, lesbian, gay, bisexual, transgender or intersex persons, indigenous peoples, rural communities, older persons, women, victims of armed conflicts and persons with an ethnic minority or migrant background. Only then can it be expected that all discrimination, including multiple and intersectional discrimination, will be tackled."
This is promising as the Committee currently is also working on a General Comment on articles 4 (3) and 33 (3) of the Convention on the Rights of Persons with Disabilities specifically, although it may need to be stressed further that States parties to the Convention must consult with autistic-led organizations (run by and for actually autistic persons), not just organizations of parents of autistic children.