All three members? I didn't find anything on John Deacon participating, and I honestly believed he retired.
Got mixed feelings about this, For me Freddie Mercury was the ultimate live performer (See "DVD's "Live at Budapest, Wembley, in Rio and the last one to have been released Queen on Fire.) His performance really improves the entire show. Paul Rodgers is going to have a tough task ahead of him.
He's not the least of singers, performing with other great musicians in the past (The Firm being my favourite band in which he played a vital role, next to Jimmy Page) So the choise for Paul to replace Freddie is not a bad one if you'd ask me.
I understand they will play in Holland also, so If ever this will be my chance to see an actual (in name) Queen concert. I doubt I will go though, I don't want to get dissapointed.