https://twitter.com/chrisconte
If this quote is correct, they did not impanel a new grand jury. They simply recalled the grand jury from the previous term of court back into session.
I served on my county's grand jury three years ago. I live in a state that borders TN. The judge told us that we would be serving as grand jurors for a period of time until the next grand jury was called. He said we would probably only meet 2-3 days and then be dismissed until/unless we were needed again during our time period. Hope this is helpful.