From Ethnologue (http://www.ethnologue.com/language/kin):
Alternate Names: Ikinyarwanda, Orunyarwanda, Ruanda, Rwanda, Rwandan, Urunyaruanda
Population: 6,490,000 in Rwanda (1998). Population total all countries: 7,189,900.
Location: Also in Burundi, Democratic Republic of the Congo, Uganda (Fumbira).
Language Status: Statutory national language (2003, Constitution, Article 5).
Classification: Niger-Congo, Atlantic-Congo, Volta-Congo, Benue-Congo, Bantoid, Southern, Narrow Bantu, Central, J, Rwanda-Rundi (D.61)
Dialects:
Bufumbwa, Gitwa, Hutu (Hera, Lera, Ndara, Ndogo, Shobyo, Tshogo, Ululera), Igikiga (Igishiru, Ikigoyi, Kiga, Tshiga), Ikinyanduga, Rutwa (Twa). Intelligible of Rundi [run].
Typology: SVO
Language Development: Poetry. New media. Radio programs. Dictionary. Grammar.
Writing: Braille script. Latin script, primary usage.