A bit more about these leaks. These were pulled off the Motorola servers and are simple to install. You put them on the SD-EXT (external memory), reboot the phone into Recovery (press Power + Volume Up/Down) and select the update (more detailed instructions are available, but that was the short version). The phone will install the update, just like it came to you OTA (Over The Air) and you'll be using the new operating system OS called ICS (for Ice Cream Sandwich).
Now, there are 5 leaks so far. If you pick one and install it, most likely you won't get the real deal when it does come out OTA. If you want to get back on the OTA path, you'll have to go back to 5.9.905 before you can. This is because Motorola/Verizon assumes you are currently on 5.9.905 and would try to send you the update to go from there. They will check your version on your phone and if it isn't (in this case) 5.9.905 they move on. Fortunately there is a way to go back (available on other threads) if you want to. On the first 4 leaks (6.7.232 is the latest) you are able to do this, but with 6.7.235 you can't. So if you want to install one of these leaks, I suggest going to 6.7.232 instead.