re-work intro

_posts/2016-09-29-Rust-1.12.md

@@ -16,20 +16,22 @@ website, and check out the [detailed release notes for 1.12.0][notes] on GitHub.
 
 ### What's in 1.12.0 stable
 
-Oh my god! So much stuff!
+The release of 1.12 might be one of the most significant Rust releases since
+1.0. We have a lot to cover, but if you don't have time for that, here's a
+summary:
 
-With 1.12 stable, one of the first visible changes you will notice is the new
-error message format emitted by `rustc`. We've [previously talked] about this
-format and this is the first release where they are broadly available. These
-error messages are a result of the effort of many hours of [volunteer effort] to
-design, test, and update every one of `rustc`s errors to the new format. We're
-excited to see what you think of them:
+The largest user-facing change in 1.12 stable is the new error message format
+emitted by `rustc`. We've [previously talked] about this format and this is the
+first stable release where they are broadly available. These error messages are
+a result of the effort of many hours of [volunteer effort] to design, test, and
+update every one of `rustc`s errors to the new format. We're excited to see
+what you think of them:
 
 ![A new mismatched trait
 error](/images/2016-09-Rust-1.12/mismatched-trait-error.png)
 
-The other major change in this release is moving to a new compiler backend based
-on the new Rust [MIR]. While this feature does not result in any new
+The largest internal change in this release is moving to a new compiler backend
+based on the new Rust [MIR]. While this feature does not result in any new
 user-visible features, it paves the way for a number of future compiler
 optimizations, and for some codebases it already results in improvements to
 compile times and reductions in code size.