Only Pre-order if you want to.
Yes it shows support for the studio and all that, but if your not going to play it at release, I don't see a reason to Pre-order really.
Some think "I'll just wait till its on sale blah blah" Let me till you It was a LOOOONG time before I saw The Witcher 3 below 40 bucks. If this game is as good as The Witcher 3, the same thing will happen.
If your not going to play it until at least a year from release, just pick up a copy then. Maybe just maybe you might find it on sale, though I doubt it.
That is the beauty of free will. You do you. No matter if you pre-order or wait and pick it up when you have time to play it. You will always be supporting CDProjektRed by just buying it. So yea it's all up to you.
I pre-ordered and paid in full for two CE, one PS4 one PC, and Grabbed a copy for my wife on GOG. I'm definitely supporting CDPR. I know it will be as good if not better than The Witcher 3, and I can't wait!!