CMOS 16 CHANGES, #7
An ellipsis indicates the omission of a word, phrase, line, paragraph, or more from a quoted passage. Ellipsis points are also used to indicate suspended or interrupted thought. But how should an ellipsis be typed? This has changed with the new edition of The Chicago Manual of Style.
The 15th edition said that an ellipsis should be typed with a space before, a space after, and a space between each dot. The publisher would convert these full spaces to microspaces during the typesetting process.
The 16th edition now says that authors may use the three-dot ellipsis character made by most word processors. There should still be a space before and after the ellipsis.