Gamecraft Miniatures posts a preview picture of new Blast Walls.
From their preview:
They will be released in 15mm, 20mm and 1/285th scale. The 15mm and 20mm versions will come in packs of single sections and 4 section pieces. The 1/285th scale version will come in packs of 12 sections in a row and can be cut to any length you desire. The photo shows the masters for the 20mm single piece and 4 piece assembly.