As an avid fan of Dead Space, this is incredibly welcome news! PCGamer has reported that the new remake will have NO Origin launcher attached to it. When reaching out to an EA rep about requiring Origin, to which the rep replied:
Dead Space is native on Steam.
EA Rep
PCGamer also noted that the timing is a bit weird since their new EA Launcher just released out of open beta and will soon replace Origin entirely. But regardless, Dead Space will not have either and be purely native to Steam.
While this wasn't confirmed to be the new norm for other EA games coming to Steam, it is still a very welcome change. This will most likely mean playing offline will be significantly easier, which it should be for single-player games, as well as that Verified symbol for no 3rd party launcher to go through! This will be an easy Day 1 purchase over here!