Trevors Hohns has given details about the selection of the Ashes squad.
He has said the Ashes squad will be selected as late as possible, possibly less than two weeks before the Ashes squad.
He has also confirmed the Australia A tour will include 5 onde day matches and three 4 day matches. This confirms that Australia A will be the opponent for the England Lions, their A side which was previously not shown.
The A squad will inlcude one day players to cover for the world cup squad and Ashes squad hopefuls. It will be lead by Tim Paine and will quite likely include Head, Harris and Patterson. Head has previously played a lot of one day cricket so could be in the squad in both roles, but someone like Ashton Turner could be in the squad despite being no where near the test side.
https://www.cricket.com.au/news/australia-england-ashes-squad-hohns-selection-world-cup-paine-head-patterson-harris/2019-03-16
List of Australia A fixtures, surely the final one.
June 20: Australia A v Northamptonshire (50-over)
June 23: Australia A v Derbyshire (50-over)
June 25: Australia A v Worcestershire (50-over)
June 30: Aus A v Gloucestershire (50-over)
July 2: Aus A v Gloucestershire (50-over)
July 7-10 Aus A v Sussex, Arundel
July 14-17: Australia A v England Lions, Canterbury
July 23-26: Australia v Australia A, Rose Bowl