Is the interest / enthusiasm still strong now the new edition has settled in?
I can only tell you about my little neck of the woods on this planet call North Texas
. Yes, the enthusiasm is still very strong and the number of guys who have come back (especially after the AoS disaster) is impressive. My FLGS has about a dozen tables; a year ago this time, you'd find maybe one/two tables playing 40K, and one of those tables would be me.
Now, at least 1/2 the store is playing 40K, and having a blast. I have yet to hear someone (in person or on the 'net) say they hate 8th Ed, or that it sucks/unbalanced/OP, whatever. Also, since the game came out in June, they have released seven codexes (Space Marines, Chaos Space Marines, Grey Knights, Ad-Mech, Death Guard, Astra Militarum and Craftworlds/Eldar), with four more coming out before the end of the year (next is Tyranids, not sure of the remaining three . . . I believe Thousand Sons/Space Wolves/not sure). I must also give props to GW for coming out with FAQs VERY quickly, and is much better at communicating with it's fan base/customers than ever before.
NOW is the time to get back in, battle brother. The Imperium needs you!