We've been testing the import on our virtualization cluster with dumps from both the MySQL and PostgreSQL wikis. You can see a preview of English WV here:
http://en.wikivoyage.beta.wmflabs.org/wiki/Main_Page
This is purely for testing, although we may keep it around as a staging environment for new code/configs post-migration. Just don't expect any edits you make there to stick around. We may prep some pages there to copy over to production later.
NOTE that this doesn't have _any_ image support, not even for Commons, it's just for testing the extensions and configuration. In addition to most of the old extensions, we've got the UserMergeAndDelete extension running, which should enable consolidation of multiple accounts from previous wikis.
This page could use some eyeballs to see if it makes sense (again, this is not real data, so you can't test migrating real accounts): http://en.wikivoyage.beta.wmflabs.org/wiki/Wikivoyage:User_account_migration
The de.wv version isn't quite ready for primetime and may be outpaced by the actual production launch.
Other than images, please take a look around and report glaring issues that you see. Note that performance is poor because it's not on production hardware yet.
Erik