Go to animefreak.tv and search Hellsing Ultimate.
This year or mid 2012.
Spring 2011
in about 6 to 10 months from July
Go to animefreak.tv and search Hellsing Ultimate
Volume 5 was pushed back and released on November 21st in Japan. The U.S. distributor, FUNimation Entertainment, hasn't announced anything thus far on the state side release, but the way Funimation has been handling it I would bet on an announcement to be made by the end of Febuary on a release date. Hellsing Ultimate OVA 6 announced for 24th July 2009, then wait a couple of weeks for the subs. Source: http://www.animenews.biz/hellsing-ova-6-launching-on-july-24th-in-japan.html
There is always a new date up on the official site whenever there's a new OVA released, so check it out: http://www.geneon-ent.co.jp/rondorobe/anime/hellsing/
There has been a change of animation studios responsible for Hellsing ova 8. So we are looking at a 2011 Release.
I have just found out that the trailer for OVA was released in Japan this March that has just passed. It is said that the reelased date for Vol.6 will be in Japan sometime August 2009.
At animefreak.tv, its under the name Hellsing Ultimate
The 6th OVA is scheduled for release on DVD and Blu-ray in Japan on July 24, 2009.[1]
Hellsing is a fictional character which is from the anime series Kouta Hirano. This series is being played on the TV and on OVA. He is voiced by Nakata.
They are still working on the English dub so they have not come out in English yet, but you can see OVA 5 & 6 with English subtitles.