These are all but confirmed to be the Glimmer's ships. The style of that enemy and these ships are completely different; there's no way that this is the Glimmer.
The best theory about what the Glimmer actually are is that they are a phantom-like race, who control other races to use as soldiers. [url=http://www.cinemablend.com/images/sections/52668/Destiny_52668.jpg]Take a look at this image[/url]. The Cabal and Fallen in it have a strange blue mist covering them, they are carrying no weapons, walking together, and each glowing the same colour of blue. This blue-green colour is similar to the beams which are coming out of the ships above. [url=http://cdn2-b.examiner.com/sites/default/files/styles/image_full_width_scaled/hash/a4/7a/a47afbbb1d5810a348c9c0032142fe24.jpg?itok=qRRePy-D]Furthermore look at these concept art images for the 5 enemy types in Destiny[/url]. The glimmer is the yellow column, as you can see by their triangular ships. Notice the other two things in this concept art? A strange, ghost-like figure, and a cloud of mist; the same mist we see in the previous image.
As for what I think this race is? I say Cabal because of it's large structure, but it very well could be the Hive too.