A Wolfram email newsletter indicates second editions of both "Hands-on Start to Wolfram Mathematica" and "An Elementary Introduction to the Wolfram Language". The former's 2nd edition is copyright 2016 (the 1st was2015); the latter's 2nd edition is copyright 2017.
What's changed in these two new editions?
Jeremy, thanks for the informative reply.
Although I'm a very experienced user of Mathematica (since version 2.2), I find that such introductions often provide considerable insight, especially about newer features.
I have read through both new books, I feel very new on wolfram's 2nd edition book, but didn't check back with first edition.