I'm not aware of there being an ETA, but according to Swift.org - Download Swift last year Swift 3.0 was released on September 13, 2016 and then a subsequent Swift 3.0.1 was released on October 28, 2016.
Alex
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On 5 Oct 2017, at 19:18, Georgios Moschovitis <george.moschovitis@icloud.com> wrote:
I am wondering, is there an ETA for 4.0.1 ?