Glenn Frey has been replaced by his son, Deacon. As you can see in the video below, he sounds pretty good covering for his dad.
Also, Vince Gill is in the band. If you're into country music at all, you know the name already. He had a truckload of country hits in the 80's and 90's, and sung on "Let Me Love You Tonight" from Pure Prairie League. He won't really flex his guitar playing skills tonight with the Eagles, but his voice you will hear, and he sounds as good as he ever has. As you'll see in the video below, he more than handles "Take It To the Limit," with his fantastic voice.
Have fun tonight if you're going, and let me know how it goes.