Well I happened to have a free month of Origin access thanks to their recent promotion, so installed their version of JKA to find out what was going on.
The game appears to be the correct version (assets3 is in base too):
However Origin's launcher does not seem to provide any way of starting multiplayer. Hitting "play" just goes straight to single player, no prompt for the executable like on Steam:
This is a little confusing as I'm not sure how Flavuseme even managed to get into multiplayer with Origin's JAMP (just like Steam, if you try to execute JAMP directly it goes through the Origin launcher and you end up with singleplayer).
EDIT: Never mind, it looks like you have to change that in advanced launch options:
Which confirms JAMP is patched (though Raven's master is still down...):