docs: update readme for Q4 2021 (#23898)

(cherry picked from commit df89f0d)

Author: jelbourn

README.md

@@ -33,20 +33,20 @@ If you'd like to contribute, please follow our [contributing guidelines][contrib
 our [`help wanted`][help-wanted] label for a list of issues with good opportunities for
 contribution.
 
-## What we're working on now (Q2 2021):
+## What we're working on now (Q4 2021):
 * Continuing to create new, API-compatible versions of the Angular Material components backed by
 [MDC Web][] ([see @jelbourn's ng-conf talk](https://youtu.be/4EXQKP-Sihw?t=891)). Much of our effort
 is dedicated towards rolling out these new versions of the components across Angular apps
-inside Google. This work will payoff with the following benefits:
+inside Google. This work will pay off with the following benefits:
   * Dramatically improve consistency with the Material Design spec, which has changed significantly
-    since Angular Material's 2016 inception.
+    since Angular Material's 2016 inception. This also makes future versions of Material Design
+    significantly easier to adopt.
   * Introduce a new theming API for component density, a top feature request.
   * Fix a number of longstanding accessibility bugs.
-  * Increase number of people working to continuously improve the components on an on-going basis
+  * Increase number of people working to continuously improve the components on an ongoing basis
     (both the Angular team and the Material Design team).
-* Continue work on virtual-scroll support for cdk/table.
-* Accessibility - we'll be doing a major pass on outstanding accessibility issues and reviewing all
-of the components for accessibility best practices such as WCAG.
+* Accessibility - we'll be focusing on improving the accessibility of `MatDatepicker` as well as
+evaluating accessibility bugs for mobile web platforms.
 
 
 ## About the team