For a few months I heard BFI was going to release Kevin Brownlow and David Gill's the 'UNKNOWN CHAPLIN' on DVD in the UK. On the charliechaplin.com site they mention BFI is planning the release in the future. (Thanks, Nancy for the info!) The US/Canada version will be released this November. More information at USA Chaplin DVD.
Also for UK fans, check this link for a bit more information on the Mutual Films Volume 2 release in November. It is available through the Chaplin UK DVD Guide.