since I only started paying attention to Game Pass recently, been googling past months to see what was added each month, especially upfront as the "showcase" games so to speak. Seems Shadow of Lara this month was by far the highest profile (at least the newest) they released, most of the other months was older / lower profile stuff:
January 2019
Just Cause 3 is pretty old, ARK I guess is the highest profile, at least indie wise, since Life is Strange 2 is just episode 1. Nothing that compares to Shadow of Lara really.
December 2018
this had back to back announcements and was pretty strong imo. Mutant Year Zero was a day 1 release, Strange Brigade is very recent, Hellblade and Shadow Warrior 2 are high-profile indies, and MKX is pretty big high profile "triple A", even if it was a bit old by then.
November 2018
This seems like a weaker month, with only Sniper Elite 4 being high profile. Keep in mind I'm not passing judgement on the games themselves.
October 2018
Back to a strong showing with Forza and Wolf New Order being obvious high profile games, and the Metro Redux (I assume Last Light was also added later in the month since both are on game pass) is also nice. Shantae on the indie side is also on the higher profile spectrum.
September 2018
Another strong month imo, with Halo MCC, Quantum Break and OnRush being quite high profile (was OnRush a day 1 release?), Snake Pass also a popular and new-ish indie release.
August 2018
Back to a weaker month imo, Hitman S1 and Ryse being the high profile games but both are quite old, but Dandara at least was quite recent at the time (and its great but again, this isnt about game quality per se).
If we continue to go backwards, the high profile or newer stuff starts to show up less and less, I can only imagine they were still ramping up the service, its only like a little over a year old right? Anyway I was just doing this little exercise to try and "guess" what we could see show up on it soon, here's some of the stuff I would like or could see happen (a lot of it mimicks what I want / expect on humble monthly aswell lol):
Elex - Released in October 2017 and been on sale a few times, and Game Pass is lacking in rpgs.
Kingdom Come Deliverance - Released in February 2018 so around 1 year old now, and has the added bonus of having dlc, I'm sure that much like Humble Monthly, getting the games "free" to push DLC is a big incentive for publishers.
Resident Evil 7 - Released in january 2017 so pretty old now, and would be a nice nudge to push people to buy RE2. I don't actually want this one as I already played it but can easily see it added.
Destiny 2 - Released September 2017 so enough time passed, has a ton of DLC to push, is on sale (and free!) all the time. Seems prime for a Game Pass addtion.
Fallout 76 - lol :(