These summaries all make me go.. WHAAAT???
it all so confusing...
Multiverse. Kal joined the Levitz Legion, while Kara joined Waid's Legion. Action #850 should clear up some questions about Waid's Legion.
More to add. Waid's Legion is the future of the current DCU. This is known by the release of Mon-El from the Phantom Zone in the current arc as well as Booster showing up in the latest issue to collect weapons for his fight in 52.
So, Kal joined another universe's Legion. This is how I'm reading the situation thus far, but DC may decide to throw a monkeywrench into this theory down the road.