It's also worth noting that that the blog post suggest that the majority of any new features will be targeted to Windows Phone 8:
Going forward we will focus our development efforts mainly to both the Android and iOS platforms. This means that all new features and enhancements will first see the light of day on these platforms. In most cases we will first launch a new features on one of the platforms and when it has been perfected with the help of your valuable feedback it will then be implemented on the other main platform and also in most cases on Windows Phone – mainly on the upcoming Windows Phone 8.
The nature of Sports Tracker - an application that runs in the background, logging your exercise routes, speeds, and timings - still does not sit comfortably with the nature of Windows Phone's background task handling (notably the suspension of apps, as opposed to a true multitasking), and as the Sports Tracker team need a significant volume of users, I can understand the change of focus from a business point of view.
It's just that having seen Sports Tracker from it's initial beta as a Nokia project, spun out into its own company on the Symbian platform (which they have confirmed is not cancelled, but in a maintenance mode), and then jump to Windows Phone... it's like an old friend saying he's not going to be around as much any more...
It's not the end of Sports Tracker as a service, and I'll commend the team for being open and honest on their plans. But I'll be holding them to those updates for Windows Phone 8!