I'm sure they will release some walkthroughs and more demos before the pre-order period is over, but they cut it very close with the Glory Days walkthroughs and I suspect we'll see similar timing here. The big problem for me is that I'm just not yet seeing the concept holding this library together and it makes it hard for me to decide whether it will be a useful addition. I really need a lot more data.OT basically started a pre-order period with just a teaser.
So at this point we can only make assumptions. And I would be surprised if they increased the pre-order price before releasing an in-depth walkthrough.
And I also prefer a "walkthrough only" rather than a "demo only" pre-order period.