Last week, we reported that Nellspeak was replacing Gumpisms. It was a short reign. The new catchphrases are Newtisms, an alphabetized collection of House Speaker Newt Gingrich's sayings from Pocket Books. But prior to publication on Jan. 19, publishers made a change to the ''B'' listing to add you guessed it that quote from his mom, Kathleen Gingrich. What does the Speaker say? ''I wouldn't think he'd be pleased they chose to include that,'' says his press secretary, Tony Blankley. ''But I hope that one of his quotes will appear in Bartlett's when it's all over.''