Possible duplicate: Visual List of iOS Fonts?
Have there been any font additions for iOS 8?
EDIT: Check out this site, as per mentioned below
Here are the new fonts introduced in iOS 8.0:
Apple SD Gothic Neo Ultra Light Damascus Light Khmer Sangam MN Khmer Sangam MN Kohinoor Devanagari Kohinoor Devanagari Light Kohinoor Devanagari Book Kohinoor Devanagari Medium Lao Sangam MN Lao Sangam MN
UPDATE: Added missing
Damascus Light. For the font name to use in code, see cnotethegr8's answer.