As always with Dreamlight I can never tell what the product is.....
Cottage House - Iray Neighbourhood Edition
So what is this?
1) A house set- shown with instances or an entire street area with repeated props?
2) A lighting set for ANOTHER PRODUCT and they just forgot to put Required Items in the description?
3) A higher-texture update to an old product?
4) A one-piece prop set that comes glued together so it's only a backdrop and static HUGE Singular thing that cannot be loaded (and used kit bashed) as individual props?
5) Says it has a skydome, so I can use this bright-as-hell daylight skydome with OTHER products and this includes another sky option?
6) I assume the houses are hollow. What happens if I look through a window?
7) Is says grass in non-flat. IS that a 'bump map' that gives the illusion of 3D or is that a 3D prop of some kind? Obviously not a shader, so how is that done?
so many questions......

Comments
Did you read the description it says
'This beautiful and serene scene, of an exterior cottage house, complete with palm trees and 360-degree scenery, will instantly transform your renders with a feeling of freedom and timeless beauty with a modern touch.'
among other things
From the whats included it very well may be a complete scene which loads all together.
Sky domes HDRIs can udually be used independantly to the scenes/props they come with.
Most 3d items are hollow.
on no 7 I can't answer as I don't have it, but if the grass is 3d then that will use a lot of Ram.
Yeah I did and I have that same description for a "Complete Scene" that is a circular pane of 2D trees and mountains.
The skydome included was a sky full of clouds that whenever I loaded it into another set, you see the flat pane that everything sits of unless you tilt the camera up at an angle.
There's hollow like EMPTY ROOM (that I can place furniture and lights in) and then there's hollow like blank 3D surface panes. As in, "you aint supposed to be looking in here."
And last, this vendor does it all.
Some are tutorials
Some are 3D models
Some are static backdrops
Some are lights for other products
And some don't say. You just have to know.
The "non-flat grass" says it is DS3 displacement maps only, so I would assume that only applies to the 3DL version and that the grass is actually just a flat plane in Iray.
One of the advantages of 3DL is that displacement is pretty easy, not very resource intensive (compared to Iray), and can create some really crazy effects. So it's not just bump mapping, it's actually displacing the geometry (if I am interpreting the description correctly). I imagine it would still work in more recent versions of DAZ Studio too, but again, just in the 3Delight render engine.
...indeed. I have AoA's Grass Shader kit which can easily be applied to uneven surfaces and looks really good, but alas it only works in 3DL. There are displacement grass shaders for Iray, just that they are not compatible with Daz so you have to use geometry resources which not only eats up memory, but is also difficult to use on uneven ground as most are based on flat plane tiles.
You get a full package with these guys usually, sometimes too much. Bought the original a long time ago, and this came in as an update.
For the grass, the original 3DL and this Iray version (Iray Uber, nothing more) use bitmaps with bump and displacement. The additional units are done with instances. Skydome is HDR, and hi-res. Render settings are included that set everything up. Basically a 2-double-click setup.
ETA: Almost all Iray surfaces have the bump maps, some of them have displacement maps (where it really shows, like the walls, grass, trees)
Well, it's half new. They could have released a separate Iray version, but it is included with the original as a free update. Works for me.