This issue will be tracked here. https://phabricator.wikimedia.org/T178893

As it says on the ticket, I hope to get this done in time for the Nov 1 run.
Here is what it means for folks who download the dumps:
* First off, the host where the dumps are generated will no longer be the host that serves them to the web (or that serves them internally via NFS).  This means that you won't see automatic minute-to-minute updates of how the dumps are doing.  I'll be rsyncing over files to the web server, probably with a several hour delay.
* Second, it's possible that the index.html or other status files that you check will point to things that aren't rsynced over yet.  If so, try again in a few hours and the files should have arrived.
* Datasets that arrive via weekly or daily cron jobs, such as the wikidata dumps or the adds/changes dumps, will not be affected at this stage.  The plan is to move them later.
* Mirrors and web service will continue to remain where they are.

I may have forgotten some things; if so I'll update as they occur to me.  Questions and/or comments welcome.

Ariel