Devs working on the latest BlackBerry 10 Dev Alpha OS and latest SDK’s may have noticed some font changes. Some of the default Adobe fonts are no longer available and RIM has added a whole list of new fonts to replace the depreciated ones. They have also set the new default font for Cascades to Slate Pro though other fonts can be substituted based on locale and region of the device. Slate Pro does not seem like a free font (Fonts.com by Rod McDonald?) but it is close to Helvetica.
What I found most interesting is that the new font support specifically adds languages that are not currently supported on the PlayBook. Specifically I am seeing Arabic, Hebrew, Japanese, Korean, Chinese, Bengali, Hindi, Thai, and a few more. This is on top of all the rest of the fonts available to components like WebWorks or developers embedding their own fonts. Kizito Kasengulu gave a great breakdown of the changes and what they mean on the DevBlog. Hopefully Kizito incorporates it into the BlackBerry 10 documentation and UI Guidelines.
Personally I am really excited to see Hebrew support and I hope it is available at launch!