Hmmm, why did they pick these four faces?

I just saw this ad for an upcoming high-def James Bond marathon over at Facebook, and two things leapt out at me. One, there are 21 films in the “official” series produced by the Broccoli family, but this marathon will apparently feature only 19 of them — which two films were left out, and why? Two, there are 6 actors who have played Bond in these films, but only 4 of them are depicted in the art duplicated here — and while it’s no surprise that one-shot George Lazenby is missing, I am struck by the fact that Timothy Dalton, who made only two films, one of which didn’t do so well in North America, is included here, whereas Pierce Brosnan, whose four films outgrossed everybody else’s until Daniel Craig came along, has been left out of the picture. Is a re-evaluation of these actors and their respective places in the franchise in the works?