Duplicate of this:
http://eurobattle.net/threads/209453-Moving-to-dual-gateway-support-this-SaturdayMoving to dual gateway support this Saturday
Move will happen 1.9.2018 in the morning when traffic is low. Those who already have client install will receive an automatic update. New installer will also be published.
To play DotA 6.88 on lagabuse you will need W3 1.26 which you can get in advance
here. Most mirrors will probably get overwhelmed so I recommend using the torrent, the more the better. You need to download the game manually, it's not part of the autoupdate.
If you play CG/PG you will be mostly unaffected by the update.
This topic will be updated with further instructions as update is being rolled out.