After a lot of trials and tribulations, all versions of the game client has now completed QA successfully. We will do no more testing on it.

All game servers will need to be taken down for updates. The maintenance period starts on Wednesday Jun 30th at 07:00AM (GMT+2). Most of them should be back up by 11:00AM (GMT+2).

During this time window, we will also release the new game client. Check back after 11:00AM (GMT+2), and try out the new game client!
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The client patch is approximately 890MB large. The list of changes is pretty much the same as is listed here. I'm going to write a post which explains some of the background behind the delays later tonight.