We have separated older editions of WIG 1:25,000 maps, which are divided according to the original materials (German, Austrian and Russian). These older sheets from 1920s can be found on a separate index sheet. We have added 6 new sheets of the older, and 14 sheets of the new (1930s') edition. All new scans at 600 dpi. A few dozens older type sheets from the area of former Austrian "partition" should become available by mid-summer.
Courtesy of Katedr Geologii i Geografii, Uniwersytet A. Mickiewicza Poznan, Poland, we have received  28 sheets of a German 1:25,00 soil / land valuation map dated 1940 - 1944. These maps are based on Polish 1:25,000 (WIG) maps, German Topographische Karte (Messtischblatt) and Russian verst maps. We might be able to add a larger number of sheets of this map type by end of this year.
There's been an update to the page with index sheets of WIG maps.
Semi-related news (for those with a passion for scanning large maps on a small-format scanner): Panavue, a long-standing software provider for stiching photographs (and maps) are closing down by September 2014. In the meantime they have made their flagship (enterprise) stitching software available for free. On their home page you will find a link to the download page. Installation is fast and painless, no strings attached, e.g. giving up personal data, registration, etc. Software can be installed in either English or French language version. While the interface is a bit dated, and the stiching does not always provide perfect results, this is still one of the best programs of this type available (no, they didn't pay us to say that).