Well that felt like a waste of an episode. Really don't feel like the tribe swap has added much at this stage - just as the natural divides in each tribe begin to emerge they reset it all by mixing the tribes up, and unlike previous seasons the blood & water twist means it's not a case of the majority in each new tribe really mattering too much.
The trouble now is with the new tribes we'll see things start to develop nicely over the next couple of episodes and then it'll be time to merge again anyway. The tribe swaps and merges should make us as viewers feel like we're moving forward to a new stage in the game, but I think they're so formulaic they actually have the opposite effect and feel like a step back.