For our friends in the international community, text rendering is possible by means of the Glyph tag.
So, for example this XAML:
<Canvas x:Name="GlyphDisplayCanvas" Canvas.Left="0" Canvas.Top="0" >
<Glyphs x:Name="GlyphDisplay" Fill="Black" FontUri="./simhei.ttf"
FontRenderingEmSize="48" UnicodeString="你好, 你好吗？" />
Will render Chinese text in WPF/E.
Please note a couple of things:
1: You have to use the FontUri to specify the font, and you must use a font that supports the characters.
2: Make sure that you are licensed to redistribute said font.
I am working on a Whitepaper for MSDN to show how this can be used in conjunction with ASP.NET controls for IME-based text input in far eastern languages.
If you read Chinese, check out my colleague, Hong Chao Wang's blog for more details...