The phrase "rollout date" refers to the specific day or time when something new, such as a product or service, becomes available or is launched to the public. Full definition
There isn't an exact rollout date for this new feature as of yet, but we'll be sure to let you know once we receive more details. (androidauthority.com)
However, we didn't know an exact rollout date. (pocket-lint.com)
Unfortunately, we still don't have Android Wear 2.0 rollout dates for first - wave devices. (pocketnow.com)