The April release comes a little early, not to avoid any April Fools jokes but due to a personal circumstances. As announced in the forum earlier this month, I will undergo eye surgery (nothing serious) and due to this event I won't be able to do the release on April 1st.
The CSVI Pro 5.9.5 release is an intermediate release as work on CSVI Pro 6 will take quite some time due to big planned changes in features. Although CSVI Pro 5.9.5 is an intermediate release some very cool new additions have been added.