Note: Oxford Dictionaries Online (ODO) and the Oxford English Dictionary (OED) are different products and intended for different users/uses. Words in ODO might not be in OED. Both dictionaries are published by Oxford University Press. This page explains the main differences between the two reference tools.
Now, as far as the new words phrases, abbreviations, etc. that were added to the ODO during the August 2014 update, this ODO blog post includes a list, examples, and links to the definitions of 50 new words.
Direct to Oxford Dictionaries Online.