Amazon is getting into health care. The company's announcement on Thursday that it's buying online pharmacy PillPack puts any doubt to rest.

The company hasn't spoken much about its plans, as it's still determining the scope through a series of brainstorming sessions with experts in the space, but its acquisitions, hiring trends and recent product development hint strongly at where it could go.

So here's a recap of what we know, what we don't and what the experts think about Amazon's potential to disrupt the $3 trillion sector.