2.11.8.1 removes the version number from the login screen but it can still be seen easily by clicking on either of the "?" icons to access help (e.g. the heading for one is "phpMyAdmin 2.11.8.1 Documentation").
Both of those "?" seem of marginal use, so a solution may be to remove them from the login screen and require a login for all the documentation.
Logged In: YES
user_id=210714
Originator: NO
I removed these two obvious links; there are other ways to access the doc directly, however.