I don't know, this guy looks like the average joe and I think he did ok on getting on and off.
YouTube - John Deere Front Loader and Backhoe Attachment Demonstration
Looks like they took it down. They keep posting info about this tractor and removing it. Man, someone tell them to stop teasing us!
John Deere Newsroom - 2011
They seem very unsure when to release it to the public. There must be a reason behind it.
A few weeks ago there was a rumor that the new tractors had problems with the steering and would have to be re-engineered. Perhaps there was some truth to it.
I believe what you are seeing is John Deere doesn't want to put the information out without having the equipment ready to deliver from the dealer. The last thing they want is to advertise them for sell and be unable to delivery quickly.
As for steering issues, I'm sure these tractors have been in testing for some time and any steering issues would have been corrected long ago. I'm sure they don't want to repeat the issues they had with the 4000 series during its intro.
OldMan