roll-out

roll-out
ˈroll-out noun [uncountable and countable]
an occasion when a new product is made available for people to buy or use
   SYN  launch:
    Sun had to cancel the intended roll-out of the 514 model.

roll-outBrE /ˈrəʊl aʊt/ 🔊NAmE /ˈroʊl aʊt/ 🔊 nounan occasion when a company introduces or starts to use a new product 新产品发布会；新产品的推出