Former England Test players Jonathan Trott and Jon Lewis are to join England's coaching staff at the Under-19 Cricket World Cup.
County champions Essex begin the defence of their title in 2018 against Yorkshire at Headingley on 13 April.
In a repeat of the 2017 final, holders Notts Outlaws will host Birmingham Bears on day one of next summer's T20 Blast.
New Zealand spinner Jeetan Patel will captain Warwickshire in the County Championship and One-Day Cup in 2018.
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Samit Patel and Brendan Taylor's superb 132-run stand helps Notts Outlaws to their first T20 title with victory over at Edgbaston.
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