AS said that they are making some major improvements to Bryce6. Well, less minor ones, at least =) What I would like to see is better metaball support (Truespace has metas and it has different shapes for metas). What you should be able to do is hold a key or something (said key would actually be displayed prominently on the screen, so that you know about it from day one) and click a primitive to make a metaball out of it. Of course some primitives, such as 2d faces and terrains, wouldn't work well as metaballs, and so they would be disabled. Also they should have improved modeling support. You need to have all of the operations you have now, just more (like direct polygon and vertex manipulation). And the ever-popular dynamics engine for animation!