LEGO Digital Designer 4.1 was just released yesterday. Chief among the changes are the removal of the 'Creator' tab (and subsequently, that 'building mode') in the opening screen, and its replacement by the 'LEGO Universe' tab.
- The LU tab is now a less feature-packed version of the LDD Universe Mode in ver. 4.0, intended to build models from the game. It's unclear whether or not the intention is to build items that can be imported into LU, but some of the 'starter templates' are apparently items that appear in-game. It would be cool to see this become somewhat integrated with the game as improvements to both LU and LDD come down the pike - but this is merely conjecture.
The LDD Universe Mode from ver. 4.0, in turn, has been replaced by 'LDD Extended' mode. In 'LDD Extended', not only do you have access to a much larger palette of pieces, but you also have access to 'legacy' or out-of-production colors (like the original grays). To activate 'LDD Extended', check out the instructions over at EuroBricks (credit where credit is due). It will show up as a fourth tab on the opening screen, if done correctly.
There are new HERO Factory pieces available in DbM mode, as well as two new Pirate ship hull pieces and a bunch of Technic bits. The addition of Chrome Silver and Chrome Gold for Universe/Extended are the most notable additions to the color palette, but the palette itself has been refined for greater usability across all building modes.
New printed pieces are available, including (for the first time) printed legs (with mostly CMFs1 prints to choose from in Universe/Extended modes. DbM allows mainly Kingdoms prints) - apparently these prints were in the code in ver. 4.0, but the legs weren't set up to accept printing yet, so the change has been made to the legs, not the prints.