I read this on Henry's site (an excellent resource, for those who aren't familiar with it):
Longer term plans
The current line-up are touring through to the end of 2009. They then have plans to record a studio album at the beginning of 2010 (as described below), followed by more touring. Some reports had Anderson (and maybe R. Wakeman) returning to the band at some point in 2010, but the latest reports suggest this will not happen.
A 1 Sep 2009 report by a fan has White, on being asked whether Anderson and R. Wakeman will return to the band, replying, "Yeah, sometime next year." In a US radio appearance later that month, White reportedly also hinted at Anderson's return. However, the current weight of evidence suggests otherwise. One well-placed rumour has that the line-up with Anderson/R. Wakeman are not talking about touring in 2010, while both Anderson and R. Wakeman have been critical of Yes lately. In the RWCC Summer Newsletter 2009 (out Sep), Wakeman said:
I have been getting more than a few people asking me what "we" are going to be performing at the YES concerts in the UK in November and am getting some startled responses when I tell them that neither Jon nor myself are anything to do with the current tour and that we are both very unhappy that they are advertising the tour as YES and not even having the courtesy or guts to list the line-up, which is nothing short of deception.
A 6 Oct news report from Classic Rock quotes Anderson:
Jon Anderson [...] insists that despite recent health problems he was fit and able to rejoin the band for their current tour – but they’d made other plans.
“The band recruited a guy from a Canadian Yes tribute band [...] I felt they could have waited until I’d recovered [...]
“I’d actually been ill for about five years and it got to the point where I couldn’t continue. I had to take a complete break – and ended up having six operations.
“I said to them I was available, but they said they were contracted to Benoit. It’s a complicated situation.
“I think it’s inappropriate and not respectful to the fans. People have bought tickets thinking I’m performing on the tour.
“I would like everybody to know that, as much as I wish the band well, they should not tour as Yes. The fans should be advised that I’m not part of the tour.”
(In fact, much of the promotion for the tour is clear about the line-up, although there are some adverts that do not mention the current band membership.)
Meanwhile, Squire and Howe have been talking about continuing with the current line-up. In a 20 Sep interview on BBC Radio 2's Johnnie Walker's Sounds of the 70s, Squire says he was at Howe's home a few days before discussing recording a new album in 2010 with David and O. Wakeman. Asked about Anderson's absense, Squire said:
For a period of time it's been difficult for Jon to... commit to doing... y'know, a large-scale tour like one has to when one takes a whole crew and the entourage on the road. It's got to be for a period of time. And his health has been a little bit fragile. Although I hear he's much more recovered than he has been. But, er, during the course of that uncertainty, we hired in Benoît to do that job and that's going extremely well.
In an early Oct UK radio interview, Squire reportedly did not rule out working with Anderson and R. Wakeman at some point in the future, but said "not for now".
(Back to me now) Face it, the Yesworld site has been upfront about the tour and all the lineup changes. I would think that anyone who's a fan of the band and wants to see the band is a regular visitor to Yesworld and other related sites, such as this one. It's no secret about Jon and Rick's health concerns and their respective replacements. This lineup may not be exactly what everyone wants to see, but it's not as if though it's a Broadway show that you bought tickets for weeks ago and the day of the performance, instead of seeing Dustin Hoffman, you're seeing his understudy.
Life goes on. The band was contractually obligated to David touring with them, not Jon. Was Jon going to pay off David's fee for taking his place on stage? A contract is a contract, as any working musician knows. You live up to it or get your pants sued. I think Jon and Rick are perhaps overreacting a bit when circumstances dictated that they couldn't tour previously and now that they can, at least one of them seemingly can't understand why he's not being allowed to join the tour.