The march release is a huge update with several months parallel work rolled into it. With the new help module which is a new skylight view along with the ARA tempo extraction, there were a lot of permutations to test and clean up.
As a result we would like to get more feedback before we release it to end users publicly. However it is available via the early access program. The public release will likely be early next week.
Also a reminder - as Craig and others have reiterated, we have never said that we would guarantee a release every month. We generally aim for it and have managed to do so in the past but some releases end up being bigger depending on the feature set and may not fit nicely into that schedule. Its also very possible that you may have a release with no new features but some bug fixes or something else like new fxchains or other content.