I paid great attention to both WWDCs. In fact I read the Swift book immediately after the announcement. However, the point I am making remains true: Obj-C isn't going away soon and the linked article is not about Swift pulling away from Obj-C (indeed, it's about Swift catching up to Obj-C -- see author's comment elsewhere in thread).
In fact, here's a link to an article explaining how to bridge from Swift to Obj-C to make use of simd.h.
Get dozens of book recommendations delivered straight to your inbox every Thursday.