From saurik himself:
Posted here.
This unreleased version of Cydia has nothing to do with iOS 5. Users should not install random updates from apt.saurik.com that are not actually released to the index unless they have specific problems they are trying to solve with a released version.
New versions of Cydia are often posted like this to prepare for new platform features related to jailbreaks, like the unionfs work that comex has been documenting recently: these changes are largely untested and users upgrading to version 1.1.2 of Cydia without an explicit recommendation to do so are doing so at their own peril.
The reason that these files are placed in public is in order to make it simpler for the mechanisms of testing things, so version numbers do not need to be changed later in the process. However, that was obviously a mistake: people now scour this server looking for "updates" and then publish articles about "releases", which is ludicrous.
Posted here.