The whole thing is a sobering read to be honest. The remix deck mapping thing is the only real surprise, but you can't blame us for hoping against hope that we'd hear something different than this:
The 2.5 update will have no relevant improvements in the domain of TRAKTORs MIDI mapping with the exception of a reworking of the names and organization of controls within the Controller Manager
A reorganization of controls and names might be helpful (though it's mildly annoying to those of us who have learned what all the current names mean) but a consistent message has been expressed from users that we want better midi mapping controls and they're pretty clearly not interested in providing that.
And of course there was this on variable beat grids: "There is currently no news on the implementation of this feature." Sigh. Again, not surprising, but it doesn't make anyone jump for joy, especially when all competing products have them and handle them well.
If I wasn't so lazy I'd be taking a much closer look at Mixxx these days.