Yes, Inspector Lewis is back but he's not in charge. Just in case you need a reminder, Lewis put his retirement papers in at the Season 6 finale. This time, he's been asked to come back, part time, as more of a consultant to various teams. Hathaway has returned from his sabbatical, has been promoted and has a new partner.
Since I wasn't feeling well, my husband joined me to watch Season 7, Episode 1, Entry Wounds while I was resting. And I think he became a fan!