In fact, this whole sale reminds me of IBM's sale of their PC division to Lenovo. Many ThinkPad fans, like me, were understandably concerned that Lenovo would not have treated the brand with enough respect. Fortunately that hasn't been the case. Long time ThinkPad designers stayed on, and today Lenovo makes some of the best ThinkPad laptops we have ever seen. The same can happen with Nokia's phone division if handled properly.
It will be a while before we will see the benefits from the sale. But here's hoping that Nokia's phone hardware engineers and Microsoft's software engineers will work closer than ever. Past Lumia hardwares has always been hampered by Microsoft's lack of dedication to the Windows Phone platform, so a hardware division that could exert some influence on Microsoft's software division will do some good.
In any case, this sale will at least gives us hope for a Lumia Surface phone with stonking good camera.