But ultimately a new appliance with a new version will be released. When that will be is anybody's guess at this point though...
Some of the other appliances have community member created update scripts (in the form of TKLPatches) so if you are particularly keen to see a newer appliance then perhaps that's something you could push for (by starting work on something like that for MediaWiki?)
The other thing to keep in mind is that it is possible that if the MediaWiki software comes from the Debian repos (rather than installed from upstream) that this bug is known and someone has figured a workaround?
I'm not completely clear on the core dev's plans...
But ultimately a new appliance with a new version will be released. When that will be is anybody's guess at this point though...
Some of the other appliances have community member created update scripts (in the form of TKLPatches) so if you are particularly keen to see a newer appliance then perhaps that's something you could push for (by starting work on something like that for MediaWiki?)
The other thing to keep in mind is that it is possible that if the MediaWiki software comes from the Debian repos (rather than installed from upstream) that this bug is known and someone has figured a workaround?