DJI just announced the introduction of a drone zoom camera called the DJI Zenmuse Z3. It is an upgrade to the popular Zenmuse X3, which is their entry level integrated drone camera used on the DJI Inspire 1 and DJI Osmo.
The Zenmuse Z3 will offer a zoom of up to 7x. That is a 3.5x optical zoom with a digital scaler doing the rest. Although the press release indicates this zoom camera is aimed mainly at industrial applications such as inspection and surveying, it certainly also gives filmmakers interesting new possibilities. A different focal length can come in handy in many filming situations.