According to a press release on its web site, on 29 April 2015 the Bank of the Republic of Burundi introduced a new family of banknotes consisting of denominations of 500, 2,000, 5,000 and 10,000 francs. The new notes are phyiscally smaller than the preceding issues, with improved security, durability, and accessibility for the sight impaired. A 1,000-franc denomination is planned for the new family (no release date has been announced), but the 100-franc note will be replaced by a coin, and 10-, 20-, and 50-franc notes will lose their legal tender status in three months, as will all old notes.
Courtesy of Hartmut Fraunhoffer (Banknote-Online) and Claudio Marana.