The reason I'm revealing this improvement in advance is that I'd like to get some feedback on how it's working. To try it out, download the following file, extract it, and replace your copy of moho.exe in the Moho program folder. (You may want to keep a copy of the old moho.exe in case you want to go back to it.) This file is a new version of Moho (Windows only right now) with the new renderer:
http://www.lostmarble.com/misc/render_q ... 2.1rt2.zip
What I'd like for you all to try is to open your existing files and try rendering them. Does the quality look good? Are there any apparent mistakes in the rendered output?
One of the changes is that the new renderer is able to correctly draw very thin lines. This will make your existing files render differently than they did before. Is this a good thing, or should Moho add some extra width to the lines in old files to get them to appear the same when rendered with the new renderer?
Basically, any feedback you may have is welcome - just add it to this thread.
Now some examples of the improvements. In every picture below, the left image is from the new renderer, while the right image is from the old one (the current version of Moho - 5.2.1).
Moho used to have a problem with shapes that are very small, or become very small in the process of scaling or camera moves. As you can see, the new renderer is better at maintaining shape definition at small sizes. In the past, small shapes would get "mushy":

The new renderer also allows fractional line widths. In the picture below, the rows from top to bottom use line widths of 0.25, 0.5, 1, 1.5, and 2. The third column in each picture shows lines with variable thicknesses. In the old renderer the differences are not very clear:

The improved rendering of lines makes the Freehand tool more expressive:

And the combination of improved shapes and lines makes imported Illustrator artwork much more accurate:

Please download the test version of Moho above and let us know what you think.