It's not a delay exactly. They said it would be mid-June at the earliest for 1.18, now they're saying that it's more like early/mid July.
Also, there's a ton of stuff other than auto-attack, and much more than that planned by the end of September (though time is running out to get through that huge list by September's End....)
More than 1.18 I'm excited to see how the game fares when 1.18, 1.19, and 1.20, the 3 "Summer Patches," are done. And I'd especially like to see what kind of things they will work on in 1.21.