In a way, this should not be a surprise as his old Twitter profile even proclaimed "Entrepreneur on loan to Microsoft focused on getting our developer mojo back." That statement already read to us that this was a temporary job for him with a finite mission, one that looks to have finally succeeded.
No doubt, he'll leave quite a hole to fill as Watson had quite the presence in getting Windows Phone back on the map, working tirelessly to get the recognition it deserved and making devs happy.
Update: Watson is leaving for Amazon. In an email to ZDnet he mentions he'll be taking on the responsibility as Director of the Kindle Cross Platform team and “it was a hard decision, but the opportunity placed in front of me that was too big to pass up.”
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Daniel Rubino is the Editor-in-chief of Windows Central, head reviewer, podcast co-host, and analyst. He has been covering Microsoft since 2007 when this site was called WMExperts (and later Windows Phone Central). His interests include Windows, laptops, next-gen computing, and for some reason, watches. Before all this tech stuff, he worked on a Ph.D. in linguistics, watched people sleep (for medical purposes!), and ran the projectors at movie theaters because it was fun.