You know they're speeding up their release cycle, right? Now a release doesn't wait for features to get finished, only the finished items get shipped.
Looks like it's going to be about a release every 2 months, so that'd make around 6 releases per year..
But it doesn't really fit the previous upgrade path (with addons becoming incompatible every major version), so they'll have to improve that. I heard something about automatic updates (similar to chrome's updates I guess).