There are a couple interesting titles but will this be enough to keep Sony from dominating? I don't think so. Sony doesn't even need to have an E3 conference and everyone knows they still have GoT from Sucker Punch, Dreams, The Last of Us Part 2, Death Stranding and Final Fantasy 7 Remake.
If Perfect Dark and Splinter Cell only started development recently and will release in 2019, that is a very short dev cycle that could hurt the quality. I think Halo 5 and Gears 4 also suffered from being rushed to prop up weak Xbone sales.