Hi. Following my thread in this forum about possible hardware problems with my JB ipad3 on 5.1.1, and whether I can keep the JB after repair, I'm considering getting an ipad4 but need to have it JB. If out of the box the iPad is on 6.1.2 or earlier, does it mean that it can be jail broken? Also, would I be able to restore my ipad3 5.1.1 backup onto it?
There is almost zero chance that you will purchase any new iPad4 device today and find that it has a jailbreakable version of IOS on it. Yes, of course if you find one with 6.1.2 on it you can jailbreak it, but the chances of that are slim. You would have to find one that had been sitting on a shelf since it was manufactured before March 2013.
The answer to your second questions is yes, you could restore the backup from your old 5.x device to a new 6.x device.