Quite surprised to find nothing about version 1.1 here - what's new?
Versions 1.1 and 1.1.1 have been tagged, but not released officially yet. You can read what's new in the tag annotations.
See also: DAVdroid 1.1 has been released
well ... it had been offered to me as update on f-droid on 20th of june already
That's because F-Droid compiles and offers the version as soon as it's tagged.