How much Lore/Story is currently available in Diablo Immortal?

So at this stage, Diablo Immortal has been released into Alpha for the general public. After having played it a bit, I found that it was not for me.

However, I am an avid follower of the Lore and Story in the Diablo series, and am very keen to know what Immortal adds to the storyline. For example, what I do know so far is:

How much story/lore have they provided so far, in the initial Alpha release?