Add more details to "What's new in 2.11"

Add a summary of the presentation content.  Also mention the 2.12
preview.

Change-Id: I5e7e1f8e92b1d5817db92a0ce5b1386ab396dc14

sat.md

diff --git a/sat.md b/sat.md
index 89aa395..a6f1d03 100644
--- a/sat.md
+++ b/sat.md
@@ -19,7 +19,11 @@
 Coffee and breakfast in breakout area.
 
 ## 9:30 am Welcome
-## 9:45 am What's new in 2.11
+## 9:45 am What's new in 2.11, what's coming in 2.12
+
+An overview of the new features and important fixes that are included
+in Gerrit 2.11, followed by a preview of the new features coming in
+Gerrit 2.12.
 
 *David Pursehouse, Sony Mobile*