On Blackberry developer’s blog there is a post telling us that the BlackBerry 10 system fonts have been updated with the new beta release of the BlackBerry 10 platform.
The default font for the Cascades UI and bbui.js in BlackBerry 10 is Slate Pro, however, other fonts can be substituted depending on the locale and region selected for the device.
The following new fonts have been added in BlackBerry 10: AkhbarOTS-Bold, AkhbarOTS, Browallia New, Browallia New Bold, Browallia New Italic, Browallia New Bold Italic, HadassahOTS-Bold, HadassahOTS, HeiseiKakuGothW5_213_C, HeiseiKakuGoth_JIS0213-B_C, HeiseiMinchoW3_JIS0213_C, HYGothic-Medium, MHeiM.GB18030_200910, MSungL.cp950.v311.1, MT Extra, SlatePro-Condensed, SlatePro-Italic, SlatePro-Light, SlatePro-LightItalic, SlatePro-Medium, SlatePro-MediumCondensed, SlatePro, Symbol, ThaiAltOTS-Bold and ThaiAltOTS.
29 fonts have become deprecated.
20 fonts have been replaced.
For more information check the blog.