Nothing publicly, though there has been an internal circular saying that the proper tests specified by RSSB in the Group Standards for clearing a route for DOO (test trains run under all possible lighting conditions, etc) may not have been done, and the executive committee will be meeting to decide what to do about it.
In the mean time, they have asked drivers not to refuse work so as not to jeopardise any future ballot on the issue, like what happened with the 12-car Gatwick dispute. (One driver refusing to work a 12-car was ruled to be illegal industrial action prior to an official ballot, therefore the entire dispute would have been nullified had the parties not settled out of court.)
Personally, I think it's just another example of GTR placing performance targets before safety, which (although I sincerely hope it doesn't) will probably result in casualties some day. I wasn't around for Railtrack, but from what I've read it sounds eerily similar.