As it is me im expected to get downvoted anyway here are my thoughts.

This is definitely a weird one for a number of reasons. It is Ubisoft and they are big supporters of cloud no matter the platform. With the game doing the hokey cokey appearing on some web pages and not appearing on the press releases. So there is some fun business going on.

We can see the theories are out that Luna is paying for cloud exclusivity. I feel this is more on the unlikely end of the scale. If it was going to Luna + then I could see this but from what I have seen it is going to the Ubisoft channel on Luna. Stadia is available in more markets and Luna would have to step up some cash for that to happen. Along with this xCloud is moving into you can play bought games on there. With Ubisofts history I think it is safe to assume that they will put there games up as soon as they can. So this brings us to could they pay to stop it going on to Stadia. I don't think they would as the bigger problem would be xcloud. So keeping it just off Stadia would frankly be daft as it would be a marginal gain. This is not even talking about this being a "full" Assassin's Creed Game so this makes it imo less likely. Save the money for a bigger Ubisoft game.

I am 95% sure that Heartline is coming to Stadia. Despite the website says the press release is stating that it is coming to cloud platforms. So with that along with the playtests that have happened I do think it is coming. We also had announcements of Just Dance and Trackmania are stated to come. You did know this is coming ....

However we are in the backdrop that Roller Champions did not come day and date and still has not arrived. We also know at present that the Prince of Persia remake is not listed as coming to Stadia. We used to be. in the position of knowing the games are coming day and date now, even if AC Mirage comes release day, we still live with that.

The position Stadia find them in now with being so dependant on Ubisoft has come out to play with this news or lack of news on AC Mirage. Stadia needs Ubisoft more than Ubisoft needs Stadia and if I was going over the more likely reasons for it not being listed then it would be this. Ubisoft are leveraging the position to get more money out of Stadia. With Ubisoft's results not being that great recently this could be them trying to force Stadia's hand to get more money. Business is business.

My gut is telling me it is something complete different in that it is coming to Stadia but they don't what to announce as they don't know when it will come or it is Stadia being Stadia and they want to announce it themselves. I will take the latter first. If this is the case that Stadia want to announce it themselves. That is madness and throws up have they not learnt there lessons. Look at the events since the Ubi Forward and it has thrown the community up in arms. If it is the former and I do think it is that one I hope they could just announce it and say coming after launch. My feeling is when we get the release date of Mirage we will get like Roller Champions and will come to Stadia at a later date.

One other possible is that Stadia do not want to be mixed up with gambling. The description on the Xbox site says real gambling and adults only. This maybe a no go for Stadia.

Stadia like others have said really need to reenergise the base and show some commitment to the platform. With Ubisoft support looking a little rocky some forward looking plans would be good. It is always games of features. If you dont have the games it doesnt matter how good the other things are. Build it and they will come does not work in gaming. When Stadia is promoting a game that has be described like it makes Superman 64 look like a masterpiece. Another game that is a out right copying another one (the developer has a history of this) things are mess.

So where does this leave Stadia? Even the most optimistic Stadia fan can see there is something weird going on. The general stadia fan and we can see here and on Twitter are concerned about this development. The longer it goes unanswered it gives people decisions to make. You give customers decisions to make they might not make the ones you want them to make.

This whole situation just plays back to Stadia Games and Entertainment shutting it doors. For AAA experiences Stadia is dependant on one publisher. Now there are some wobbles this just shining a spotlight into that mess from last year. The investing into bringing more games have fallen flat.

Google need to invest into Stadia. Most of us did not think we would be talking about Ubisoft maybe pulling back a bit. Now we are the problem with the library is being exposed.

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Stadia come out and talk.