Minecraft wiki entry for Frostburn_Update, associated text: This update has the fewest amount of snapshots to date, with a mere 3 compared to the 20–30 from previous updates.
The time span between the releases of 16w20a and 1.10-pre1 was only 2 weeks, unusual based on Mojang's history, as 1.8 and 1.9 both took around a year or so to develop.
This update's changelog continues the trend of having "Removed Herobrine" at the very end.
The update had only 2 further revisions, 1.10.1 and 1.10.2, which drastically shrunk from 1.7 (with 7 revisions), 1.8 (9 revisions), and 1.9 (4 revisions).
This trend of only two revisions continued for two and a half years, up until 1.13.2.