There are now 870,000 words and phrases as entries in the OED and there are well over 3 million illustrative quotations, according to a piece on the OED website by Chief Editor, John Simpson (available here to everyone, not just OED subscribers).
During the last quarter entries between 'affable' and 'always' have been looked at and updated if they needed to be. This group of words was originally in the very first volume of the OED to be published in 1884, before James Murray, the then editor, got fully into his stride, and hasn't been updated since, so the OED lexicographers certainly have had their work cut out over the last three months.
Around 90% of the words in this group - many of the words that begin al- -- mention Arabic in their etymology, and over 50 mention Spanish.
The verb 'allow' was in the group edited over the last quarter. It has 23 subsenses, including an early meaning - to praise (allow is derived from Latin laudare, to praise).
Atishoo has been in the OED since 1933, but achoo has just gone in with the same meaning (sound of a sneeze); it is also spelled occasionally as aitchoo, achew, ahchew, ahschoo, ahshoo, ahchoo, atchoo, aitshoo. Despite only just going in to the Dictionary, the first citation is from 1843.
Other new entries this month include:
afizz: in a fizz
aflap: worried, agitated
a-flying: in flight
Afro-Saxon: a person of African descent who identifies closely with English or Anglo-American culture and values
agarbatti: an incense stick
aggressee: a person, nation, etc. towards whom or which aggression is directed
aginer: a person who is against something
agrochemistry: = agricultural chemistry (which was previously in the Dictionary at the 'agricultural' entry)
ahistoricism: a lack of regard for history
akkadogram: a cuneiform character of the Akkadian language
alakazam: a magic word said when performing a trick
alcoholiday: a holiday or period of leisure spent drinking alcohol
alderperson: non-sexist substitute for alderman or alderwoman
Alf Garnett: a man resembling Alf Garnett (from the sitcom) in behaviour or outlook
algorithmics: the study or use of algorithms
all fives: on hands, knees and buttocks (cf all fours)
all righty: all right
Just because a word has gone into the OED for the first time in the year 2012 does not mean that it is a new word. Again-chare has entered the Dictionary this quarter, but it was a word used pre-1066. Again-going has just gone in, but has been tagged as 'obsolete'; it means 'the action of going to meet someone'.
You can see all the new entries here.