While there are some interesting aircraft already confirmed, there is alot of 'ill feeling' towards whats already confirmed as not special enough. With all but the Red Arrows now confirmed for the UK Military, I would expect to see some nice aircraft added to the list over the coming months.
Star things for me so far is the Columbian KC-767 and Brazilian R-99.
To answer the question Yes. I have just received the tickets for the Pimms Enclosure. My Boss, his partner and I will be going on the Saturday 20th (planning to hit the road at oh dark early to get there for doors opening).
Even though the US will not be there I still feel there will be enough to keep people happy. I must say I am looking forward to seeing the RAF Tristar flying. I am lucky enough that I see the Tristars / C-17s (and in the past VC-10s) on a fairly regular basis. The drawback is that they are all flying into BHX with wounded on board for transfer to Hospital here in Birmingham. I must also admit that I cannot wait to see the Voyager (A330).