My client would like to make use of some of the features of the current developer preview release (not the nightly).
From what I can see, it's very stable (nice work gidgreen!).
As an experienced PHP developer I'd be happy enough with taking on the risk of using it for his site (and so is he), but for this question.
1.4 developer preview makes some changes - database queries, reindexing etc. Will the final 1.4.x release be happy to work with/upgrade a database that has already had the migrations from the preview release applied, or should we wait?