I think opinions on this may vary just depending upon when you got into Saxon. Killing Ground was one of the first albums I heard, its the album that really got me 'into' Saxon and then I went back and bought the entire rest of the back catalogue.
For me, if I had to choose one song to get rid of in the setlist it would probably be The Eagle Has Landed. I don't mind the song but its long and slow and to hear it every night I've seen Saxon is a bit monotonous -- however, I'm sure this song holds good memories for all the more veteran Saxon fans so the band will probably want to keep it.
I'd also like to see them get rid of the drum solo, although its quite an impressive performance as drum solos go I got the impression, ESPECIALLY at Bloodstock, that a lot of people were getting seriously bored during that even though personally I don't mind it.
Also, to be honest, I think when the band gets rid of songs from the setlist this year then they should be replaced with songs from the new album rather than ANY covers they might have played in the past. Obviously I haven't heard it yet, but I simply KNOW its going to be fookin brilliant!