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.''