Loveless on DVD IMO has quite a slim chance of being released.
For one, the dvd's are sub only (I know cause I imported them), which cuts off alot of the casual buyers over here. Secondly, if MVM decided to pick it up, they'd most probably want to have a dub for the series, or have a dub made which costs more money.
There's not a huge market over here as of yet for a series like Loveless. Not just because it's shonen-ai (which hasn't taken off to the extent it has in America) but more because of the style of it. It's narrative and general feeling whilst watching is quite different from most series, which could also cut off potential viewers. Also, Loveless is targeted for a female demographic, and as ADV and such have said, series like that just don't sell as well as hoped (for example, Pretear, and their decisions not to release Princess Tutu etc)
Another key point is that Loveless, as far as I know, hasn't been released in Australia yet. MVM (who would be most likely to pick it up) have a habit of working closely with Madman in order to bring series to both Australia and the UK (as PAL conversion, once more, costs money).
Overall, I just don't see Loveless as something likely to be brought over to the UK. I hope I'm wrong as it is an excellent series, but being realistic, the chances are slim when series like Cardcaptor Sakura, which is seen as one of the defining shoujo anime, and is sub only like Loveless, and is more popular in the anime circuit, hasn't even been picked up.