It's according to who you buy from. Most or all of the seller's recommended here will be selling the latest version which will likely be from the newest batch or two. But you could wind up with an older version or even a fake buying elsewhere.
The night-time vid capability of these cams is not rated as very good; there are better cams for that but those cost a lot more. In comparison to other cams in this price range the G1Wc holds it's own or outperforms the others in this regard. Rear cams can generally be lesser cams as the action you'll need to see will be close-in so unless you need the best you can use it for that purpose and it should serve you well there. The only downside I can think of is that the start-up screen cannot be turned off so it will show for the minimum of 3 minutes on start-up, and that could be rather distracting at night- but nothing that a piece of thick tape couldn't fix
Phil