While I don’t have any books underway at the moment, there are some recent releases available. 365 Build-It-Yourself Engineering Projects came out at Costco in September 2020 and I am waiting to find out about a re-release in stores. I’ll be sure to keep you posted!
On top of that, Quarto (my publisher) re-released 365 Weird & Wonderful Science Experiments as a set of 4 smaller books. The same great projects just in a smaller package!