One of the Facebook users Brian Lagasse pointed out in a discussion to which I can't agree more.
I still can't wrap my head around why any one would want to use this. Is this like Cygwin or a Virtual Machine? Does this allow you to perform bash wizardry on windows servers? Did they realize Power Shell sucks and brought in the GNU to save face?
Any serious Open Source developer knows they just need an SSH terminal on any system to be able to tap into a massive amount of resources in a cloud, private datacenter or ghetto cluster in the basement made from recycled machines without licensing limiting the amount of processing power available or the amount of machines you can connect to or scale.
I don't see this affecting open Source Development in any way or actually benefiting it aside from windows users now able to learn bash and basic Linux locally instead of through SSH or a VM. We will probably continue to see an onslaught of backdoors and malware over the summer affecting the MS platforms which will hopefully result in more Open Source developers using Open Source.