Activist investor Robert Chapman promises "big news" regarding Herbalife (NYSE: HLF) sometime today or early tomorrow, which could be a possible lawsuit against Ackman, FOX Business Network's Charles Gasparino notes on Twitter.

@CGasparino
"Robert Chapman promises "big news" regarding Herbalife sometime today or early tomorrow; possible lawsuit against Ackman?"

Shares of HLF are pushing higher, last $37.50 (+2.5%).

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Dan Loeb's Herbalife (HLF) Stake was Chapman's 'Big News'January 9, 2013 10:34 AM