Just look it up on Google news or something for tons more articles.
Domestically, it appears to be caught in some dispute over its legitimacy. Who knows if the Puerto Rican government will act on it. If they do, how will the US government respond? Will we have a 51st state, with 2 more senators and at least one more representative? PR is more populated than quite a lot of states, so in fairness it should have well over one representative.
How would we even handle this process and how would it change the country?