As he often does, the Xbox head honcho Phil Spencer took some time to answer fan questions on Twitter recently, and talked about things like Rise of the Tomb Raider and the Cortana helper in the dashboard. One of the questions he got was about Sunset Overdrive and the possibility of a sequel, to which he answered: "On SO, good things can get revisited. We aren't doing anything right now though."
That means that even if there were to be another game, it will take quite some time as the average development these days are at least 2-3 years for AAA titles.
Another Xbox gamer was curious if there is any chance that Project Gotham Racing 3 might be backwards compatible for Xbox One, but that doesn't seem likely: "Challenge with games that have a lot of licenses is most licenses are done per platform, licenses would have to be redone for X1."
That sounds like a 'no' to our ears. There's still hope Microsoft will do a proper sequel though. Let's keep our fingers crossed!