Change logs and proper release notes are very appreciated by administrators and end users. Disclosure of known issues is particularly valued, and it also benefits the vendor because it reduces nuisance calls to technical support. Fixed, pending and wontfix lists are especially appreciated by sysadmins, since they are the ones most immediately impacted by the change - do they install the patch and deploy it immediately, or do they live with the current build until pending issues are fixed, etc.
Plus, it instills trust. A veil of secrecy does not earn trust from your customers, nor does a vague "fixed misc. bugs and implemented misc. performance enhancements" because one is more inclined to not upgrade rather than proceed with it and possibly risk downtime.
Of course I am saying this blindly, since the submitter did not specify what sort of software this is. Is it a server app? A commercial desktop app? Or is it a game or other entertainment software which is not mission-critical, where downtime can cost thousands to tends of thousands per hour?