FWIW the GDPR issue is actively being worked on. There are comments from Iain on the GitHub issues discussing some of the complications and his approach to solving them. Unfortunately sometimes things end up being more complicated than anticipated, but I think we've been reasonably open about what's happening with that.
Believe it or not we have other developers who continue working on other things in the mean time. In fact the new templates were developed by 
Kyatric and not one of the main Construct developers, so that didn't really take up any of our developer time at all. The idea we should hold back anything new even if it's done just because there might be other issues seems pretty bizarre to me.
I think we've done a great job with Construct 3 and I'm really happy with the way things are going overall. Most of our development resources have been taken up with work on the C3 runtime and the new timeline, both of which are major, long-term projects. I think by the end of this year a lot of that work will be approaching done and we'll have more time to accelerate work on new features.