Cyva, Cyman, VY1V4, and VY2V3 were rereleased as Cyva/Cyman II, VY1, and VY2, old versions taken off the store. Aside from some minor edits, they're pretty much the same vocals, even their separate pages just list their old demos and stuff.
They probably aren't worth buying over again, but if you've got V3/4 and are missing at least one of the four, the discounted premium package is only about $214. For reference, buying VY2 by himself is close to $100, and the editor's base package with the discount is roughly $140, so unless you plan to buy one second hand, it's more worth it to go premium.
EDIT:
A friend bought V5 and found something interesting. Within the files, Lorra appears to have a setup.bmp, and an icon. The icon is her V3 setup, it looks like, but none of the other private Vocaloids appear to have one at all. Girl's got her own directory and everything. If anyone's interested in looking, it's here: C:\Program Files\Common Files\VOCALOID5\Resource\Voice\BM8DDES6M4XP2MCC
Looks like she might get some fixes and be ported to V5? Could be interesting
EDIT2:
Here's her icon