Sorry, but have never heard of it. It is not found on the Dave's Garden list of Hydrangea cultivars, nor is it listed in any current publication about Hydrangeas.
Possibly a clone or renaming of an existing remontant cultivar, such as 'Endless Summer', 'Penny Mac', 'Decatur Blue', 'Oak Hill', etc.
Who has it for sale, Local nursery or mail-order? If mail-order, I would be wary of any performance claims.
If the listing nursery has a return address in Bloomington, IL or Lawrenceburg, IN, you would be well advised to shop elsewhere! In any case, when ordering from a MO Nursery, check them out first at Dave's GardenWatchDog. MHO
Rb

Here is a link that might be useful: Dave's GardenWatchDog

can't comment on performance as i don't grow it but it's listed as one of the "forever and ever" series for northern gardeners at the link below.
available through one of the box-store garden centers.

Here is a link that might be useful: blue heaven hydrangea

I bought "Blue Heaven" at a local Wal-Mart in Dayton, Ohio. It is my first hydrangea ever and I was very lucky. The blooms have been gigantic and beautiful. Hopefully it will make it through the winter and perform well next year.

I just picked up a big 'Blue Heaven' from the local nursery. I have a spot picked out for it right next to my Endless Summer hydrangea. Can't wait to see how this variety does compared to E.S. which doesn't seem to bloom a whole lot for me. :>(

matt...I purchased a BH hydrangea last summer. I didn't cover it up because I didn't think it was necessary. It's coming back very slowly compared to my ES. I was told it was probably due to the late summer when I put it in the ground.....Oh well. I did buy 2 more and I am gonna try growing them in pots to control the intense blue color....This year I didn't put any protection on my NB and it has blooms all over!! Go figure...I sure can't...But I just love these plants in the garden. Good luck with your BH!

Lowes is loaded with them here--HD seems to favor the ES-do not know how they will do but will try one,,,,

I looked at them in Lowes today and ended up buying the Forever & ever Together instead because I liked the idea that it changes color as the season wears on its supposed to change from blue to burgandy. I also bought a red glowing embers because the price made it worth trying. I went home and checked out the web sight for the forever &ever hydrangeas and decided I need to go back and get the Blue Heaven as well. The web sight says the flower get up to 12 ichs across and the ones at Lowes had a nice intence blue color much darker blue than the two endless summers I have bought. They also have a new red out as part of the forever and ever series but none where in bloom so I think I,ll wait on that.