How does tablet integration even work?

I am not the only one who has very little, if not any information at all on the topic of tablet apps and the way people use them to play with people playing the core game.

A couple questions:

1) Do you have to pay for the app?

2) Do these apps only work on tablet, or can they work on smartphones, iPods, and PCs?

3) How do you control your search for servers you want to join?

I'm legitimately excited for the possibility this concept has to offer. In a perfect world for me, I see myself downloading a free app on my smartphone and using it to find a friends server on, for example, "Battlefield 4" briefly when I'm waiting at school or maybe I'm at my friends house and since the game isn't split-screen I can still help and feel awesome. I could even help friends with a game I don't even own.

If these only work on tablets, which I have no incentive or means of affording/owning one AND I have to pay for the app, all worth of this concept disintegrates for me. Anyways, can anyone answer these questions?

Also, polls!!

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