Beta features are more likely than alpha features (alpha = in-house testing, beta = public testing).

We normally have a good idea on what will be released, but you can never bet on something. If we find a major error, or we just don't think something is good enough yet, we'll hold off on releasing it.

To get a better idea on what is finished and being testing in the beta test group, read this list: http://www.conitec.net/beta/