The factory is machining the molds for the new tank and related components. Just in case you're wondering what's involved, here's an exploded view of the mold for the tank:
And no, it's not built from lego blocks, the fancy colors are just for clarity. Click the photo to download a 3D pdf file (you'll probably have to save it and open it in a viewer that supports 3D pdfs.)
If you look closely, you can see the SP-645 tank in the middle (light blue).
We estimating another four weeks before we see pre-pre-production samples and another four weeks after that before we get the first production units.