FamilySearch Indexing has reached about 50%.
FamilySearch has released indexes to six additional states: Alaska, Arizona, Colorado, Idaho, Nevada, and Vermont. That brings the total to 14.
Because these are smaller states, the index represents just about 9% of the total size of the index.
The Ancestry.com index is still at about 1.5%.
The MyHeritage index is above 0.8%, but by an unknown amount.
via The Ancestry Insider: 1940 Census Update for 28 May 2012.