Bugzilla's JSON-RPC service doesn't return all details of products in 4.0; in 4.2 this is extended to include, for instance, the set of components you can file against, which is needed for clients to file bugs with.
http://www.bugzilla.org/docs/tip/en/html/api/Bugzilla/WebService/Product.html#get
Would be nice to have. :)
Version: unspecified
Severity: enhancement
URL: https://bugzillaupdate.wordpress.com/