Gloucestershire extend batsman George Hankins' contract to the end of the 2021 season.
Gloucestershire sign Stuart Whittingham after the right-arm fast bowler is released from his contract at Sussex.
The England & Wales Cricket Board confirm their new competition in 2020 will be 100 balls a side - made up of ten 10-ball overs.
County champions Surrey will start their defence of the title in April 2019 with a home match against Essex.
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Worcestershire Rapids' Brett D'Oliveira finishes with figures of 4-26 as his side beat Gloucestershire by five wickets to reach the T20 Blast Finals Day for the first time.
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How to get into cricket
How to get into cricket - physical exertion with a chess-like element in matches which range from half an hour to five days.