Based on the eponymous SF novel (part of a trilogy) by Richard K. Morgan. If the trailer feels confusing, and it does: the series follows Takeshi Kovacs, a former special ops agent ("Envoy", in the novel's parlance), now working as an investigator/mercenary/advisor/hired gun/anything really. In the setting, everyone is fitted with a cortical implant that stores and backs up memories, and people (those that can afford to) can change bodies, "travel" by uploading their memories to remote hosts, and live forever by swapping bodies for younger models. There are several plot points revolving around this, the concept is very well integrated into the book (and hopefully the show as well). The first book I recommend, but as the trilogy progresses it gets weirder and (in my opinion) worse. I spoke to Richard K. Morgan at a con once. He seems like a cool guy.