Dolphin Viewer 1.5.43.3627 was released a couple of days ago. Also the support policy was published. See: Dolphin Viewer 1.5.43.3627 and Support policy.
The changes in the viewer are minor. The viewer checks whether it is current and lets you know if you need to download an update.
The RLV sections have been upgraded to version 2.4.0. RLV = Restrained Love Viewer – for those into master/slave relationships and the BDSM thing. Essentially it allows another person to have a great deal of control over your avatar.