I wonder what the impact of this will be on most developers?

While the idea of running Android apps On Windows PCs is interesting, Bajarin makes a more interesting strategic point. If Windows 8 tablet users can indeed just run Android apps what reason will there be for mobile developers have to spend time porting their applications to Windows 8 when they can kill two mobile OS birds with one programming stone?
The BlueStacks Android Player is also available for any Windows XP, 7 or 8 PC directly from BlueStacks. AMD claims though that their version of the program thanks to "the collaboration with BlueStacks with optimizations for AMD GPU and APU [accelerated processing unit] technology enables a superior experience on AMD-powered PCs."
BlueStacks and AMD bring Android apps to Windows

Microsoft seems happy enough.

BlueStacks' Rosen says that most of the people at Microsoft he's spoken to have been receptive to BlueStacks powering Android apps on Windows. "Microsoft gets all the apps that they want," he said in an interview before CES.

BlueStacks for Windows 8 has buttoned up several hardware partners, although it was reluctant to name more than a few names at this time. It did call out AMD, which has BlueStacks available for hands-on demos on computers at its CES booth; Hewlett-Packard, which will be providing the software on its All-in-One PCs; and InHon, a Taiwanese newcomer to the PC marketplace that will be releasing a carbon-fiber ultrabook line in March 2012. InHon will include BlueStacks on its upcoming Windows 7 line, as well as its Windows 8 computers when they come out later in 2012.
BlueStacks goes Metro with Windows 8