So, this has been asked and answered several times. Could search this topic to see all the responses. But, it boils down to this; This game is 'more or less' complete with all it's DLC--not likely to get any more completed honestly. And, there's a ton of mods for it. So, the new version has a while to go, no DLC for it yet, nor any mods. If you REALLY like what you've experienced with the demo, then just be aware that this version is VERY similar and only missing a few little cosmetic differences and fluids. Plus the shop is all one large shop instead of spread out.
It's up to you.....wait for who knows how long for an incomplete version or.....get the Platinum pkg on this one during a really good sale. You decide.