Anyone who was hoping to be able to use the new launcher (such as myself) will be happy to know that you can! It appears that the option is there in the 4.2 OTA update, it is just hidden from the settings menu. I assume that Asus are probably still working on it and will release it in a future update.
The only modification I made to Droid-Eye's method was to simply use a setting shortcut widget rather than an entire launcher option such as ADW.
I used 'Secure Settings' from Google Play, which is free. Please bear in mind you also need an Ipack for an icon for your shortcut. Luckily Secure Settings has a handy link to download free ones from Google Play when you are setting up your shortcut.
I hope it helps anyone desperte to try out the new launcher style. It seems many people hate the new launcher, and I'll admit that I did myself the first time I saw it. However, it has grown on me and I'm going to give it a run to see if I like it over the old style. I can always change back...for the moment anyway.
Note: There is no need to be rooted or unlocked to do this. You can always change back to previous launcher by setting up another shortcut widget in the new style launcher. Your tablet will need to restart to make the change, that is normal.