There is not much dedicated blog or website for news about the tournament as of now, probably due to the much attention paid to the Europe Nations league, but I'm sure there will be a lot when the tournament gets underway.
Thanks for those links, I checked them out a bit. They are OK but not exactly what I was looking for. I have a feeling that this years Copa America is flying under the radar. Maybe I am wrong but it seems to me that previous editions had much bigger media coverage. I didn't even know it's being played this summer until I found this pool and I am following football news on daily basis.