When is the asset store going to be available?
Not decided yet. This depends on the popularity of the engine during the upcoming months. For now we focus on engine itself but I think at some point we will also continue developing Store.
The Asset Store is either going to make or break this game engine. So if I were you, I would consider getting this up & running ASAP.
Also I would also suggest that you put some of the stuff that you show the videos of on your website on the asset store so that people can at least get started looking to see how your engine actually works.
As for me, I like the engine so far, but the deal breaker is that there are no assets to work with, and the templates you have are not very inspiring. You need templates that allow people to start working right of the box & get their game going.
Just some suggestions.