When is the next xbox one exclusive? Is gears the only one they have this year?
It's the only one confirmed for this year. Likely anything they announce at E3 will have a PC version. Forza 6 just got a PC beta and Halo 5's Forge is getting a PC release which is awfully dang close to confirming a PC version of the actual game. The head of The Coalition did entertain the idea of a PC version of Gears 4 and the Gears 1 remaster already got a PC release.
The XB1 library overlapping too much with PC is not the only problem. It's also lacking on multiple genres. The fighting genre is one of them. While Killer Instinct is doing great, it's only one game. Mortal Kombat X and Dead or Alive 5: Last Round are also available on the PS4 and PC. Street Fighter V, while it didn't sell all that well, is only on PS4 and PC. Over the next months, the PS4 will be getting Guilty Gear Xrd Revelator and The King of Fighters XIV. Tekken is rumored to be skipping the XB1.
It is even worse when it comes to JRPGs. The XB1 is the absolute worst console for this genre. The only JRPGs I can think off the top of my head are FF Type-0 and Stranger in the Sword City. The former is available on the PS4/PC and the PS4 version outsold the XB1 by a 4 to 1 ratio in the US. Stranger in the Sword City is digital-only on the XB1, but you can get it physically on the Vita. Not only does the XB1 lack JRPGs even when counting multiplats, but the gap between them is large. Type-0 came out in March 17, 2015. Stranger in the Sword City came out in March 22, 2016. The next JRPG the XB1 is getting is FFXV, which doesn't come out until September 30. This is not sufficient enough to retain the JRPG fanbase. In fact, it's absolutely pathetic.
Compare that to what the PS4 has gotten/will be getting.
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While the vast majority of the JRPGs I've listed are niche, there is enough to go around throughout 2015 and 2016. That helps retain and perhaps, even grow the JRPG fanbase on the PS4.
Hell, you even missed some on that list. Like World of Final Fantasy which is confirmed console exclusive to PS4, handheld exclusive to Vita, with a possible PC version later. Nioh could possibly release this year as well. Though whether that qualifies as JRPG is debatable. Like Bloodborne.