Hi boleyd
TS2009 World Builder Edition properly supports much high resolution textures that previous versions, as well as having much better support for normals maps (except for some bugs), and many other 'backend' or 'unseen' updates/fixes. The world builder edition of TS2009 was designed mainly as a focus on code updates, to give content creators (and users once the content creators began to start making new content for it) access to these new features. Granted, many content creators are still happy making for pre TS2009. However, there are others who are working on TS2009 content.
At this stage, the built in content that is built to '09 standard' is as follows: UP SD40-2, Tree, Station Wallangarra, a road, a hedge spline, TS2009 track, a ground texture (stones with puddles IIRC). To locate all build 2.9/3.0 assets ingame, use the built-in content filter, use the Min Trainz Build No. filter, and set it to '2.9'. This will filter out all pre TS2009 assets.
Added to the above is the TS2009 content that is now appearing on the DLS. If you go to the TRS04
DLS page, you will find a check box for TS2009. Have only this ticked, then do a search (leave the search box empty). You now have all of the TS2009 standard assets that are currently available. These include 50 ground textures, many new tracks, and other various items.
Have fun
Zec