My guess is the 22nd as they'll be putting it out like a regular patch/update on that day.
@Turelus - EU PC Megaserver "Don't count on others for help. In the end each of us is in this alone. The survivors are those who know how to look out for themselves."
To be fair I will have exams so I won't be able to play during 22 - 24 in any case. It isn't a problem for me but pre-downloading the DLC would be a good idea.
As a person with slow internet speed i absolutely hate that there is no transition period between patch being avaliable for download and patch being activated.
To be fair most if the mmos I've played outside if wow don't do a pre download. Realistically it's gonna be only early access players who will be on vvardenfall everyone else will still be on the main land, so may not be to bad.