While you are right, it does take an incredible amount of work, regardless of whether the train was being flipped around or not that work was going to be done. The trains are disassembled every off season and as the individual parts are cleaned it is determined what needs replacing. The trains are then put back together, and as you said this takes an incredible amount of work and attention to detail. It is also very time consuming. Now with turning the backwards Racer forwards they have two options:
1: As DeloreanRider stated the brake fins are located to one side (Rider, the chain dogs and rollback do only work in one direction but they are located in the center, hence why the brake fin is off center) This means that the brakes for the ride are located off-center on the track. If the train is rebuilt as it was in past years and just put on the track in a different direction then they would have to change all those brakes on the track around.
That seems like it would be more work than needed and that there is an easier sollution:
2: Just flip the brake fins on the undercarriage around so that they line up with the brakes on the track. Essentially you're doing the same off season work except just putting the fin back on on the other side.
Like DeloreanRider said, no matter which option is chosen it is time consuming and unless they want The Racer opening late in the season I'd wager that the decision has been made and they are saving the official announcement for a later press release.
The other option would to be; since the frame and the body are in essence to separate sections, to in the re-assembling of the trains, attempt to modify them such that the bodies go back together facing the opposite direction on the frames. It's been a while since I've taken a good hard look at the frames of one of these cars so I'm not sure how much easier it would be but I'm sure it's possible. I know that some of the electrical contacts that stick out would have to be modified and probably other things.
Reguardless the bottom line is either way, it is a big task to turn the trains around.