Wondering if they might announce a new Blue Byte game like Settlers or Anno at GamesCom. Both series have been on Nintendo platforms before and would fit into Ubisoft wanting to focus more on all-age games for the Switch.
Would be nice, but just a speculation of mine.
A new Settlers game on PC & Switch would be nice, I think 7 was really under appreciated. Unfortunately Blue Byte seem to have been doing a lot of support development for big Ubisoft projects recently, I hope they're allowed to go back to work on their own projects soon.
I honestly don't see any of these as a possibility on switch. Mayyyyybeeee crew 2. We are most likely going to see a couple more original titles custom made for switch like Mario rabbids than the ones you listed.
They released AC:III, AC:IV, Splinter Cell Blacklist and Watch Dogs on Wii U, so I don't see why you'd rule out these kinds of games on the vastly more successful Switch. Especially as they're already porting their two main engines to the platform.
I also think you vastly underestimate what's required for "original titles custom made for switch". Mario + Rabbids is a 3 year project spread over two development studios, it is absolutely not a low budget title by any means. More importantly, though, making games for individual platforms just doesn't make financial sense any more for third parties unless they're locked down to that platform for some technical or legal reason. The cost of developing games has gone up so much, and the cost of porting them to a new platform is now a very small proportion of that development cost, so there's really no reason not to bring every game to every platform that can accommodate it. They could have made Starlink, for example, Switch exclusive, but why throw away a huge audience by not bringing it to PS4 and XBO as well? The engine already runs on all three platforms, so the port costs are minimal and they're increasing their audience by perhaps 100m people.
Mario + Rabbids is obviously an exception, as they've been given access to the most valuable IP in gaming, and quite obviously don't have the option of releasing on other platforms. Unless Nintendo hand over any other IPs, though, I doubt we're going to see any other exclusive Switch games from Ubisoft.