Not sure what you mean about the history tour? It is called the History of the Eagles Tour.
I can relate about the tickets being on sale so soon. I've wanted them to put some time between the announcement and the shows, but this is an announcement of dates (and not prices), on sale two days later, then waiting 3.5 to 4 months for the shows! But, 99% of the people going to shows, it's obvious which show they'll go to and so no need to 'plan'.