I have only played in 7th edition. I know, I know. A lot of people are going to have issues with someone whose view of the game is narrowed by the fact they didn't play in previous editions. But I've played a lot of 7th edition. I help out at the local GW teaching people from the 40K to learn how to play WFB. With 8th edition coming out, I want to see how the game really changes. With the rumors floating around the net about the up-coming edition, I'm pretty excited. I don't want to go into all the rumors that are out there, but I will hit on some of them.
As a final note, we don't what will actually be true until the book comes out. So until then, grab some salt, dust-off a flame-shield, keep an open mind, and enjoy the ride.