We're quite excited about our upcoming WPF 3.5 release which will now support seven Indic scripts!!
For those of you curious about what languages this implies, here's a mapping between scripts, languages, and fonts:
Script
Font
Languages
Devangari
Mangal
Hindi, Marathi, Sanskrit
Bengali
Vrinda
Gujarati
Shruti
Gurmukhi
Raavi
Punjabi
Oriya
Kalinga
Tamil
Latha
Telugu
Gautami
Kannada
Tunga
Malayalam
Kartika
For other new upcoming features, check out Tim Sneath's blog.
Note: Indic script support is not available in the current public Beta, it will be available in the final release.
-Chris Han