Baba,
Every news that is sent out to the market has to go through market regulators' hands before it is disclosed to the public.
You believe that POET's found out that there was a leak of news to come, well this is your guess.
Mine is that POET requested the halt first-hand in the morning as part of their strategy to gain market attention
Volume wise, the trading wasn't that much spectacular, a leak or rumours, that's the question.
At the end of the day, one thing stands, a news is pending.