Things to note: main colors are blue, black and orange.
This differs from the normal Galra uniform, which is traditionally purple, yellow and red. With the exception of Weblum Galra, they also appear to wear sarouel pants, which is not something we see in the Empire’s uniform.
(Admittedly, Weblum Galra was in space, and just like Keith and Hunk, they were probably wearing a suit designed for space, not their traditional uniform, which may involve the sarouel pants. We don’t know for sure yet if that’s their go to uniform or an adapted one.)
It also differs from the Blade of Marmora uniform, which is purple, black and gray.
But we also know for sure that whoever these people are, they’re definitely Galra and definitely associated with the Empire.
But They’re definitely not BoM and although they seem to be affiliated with the Empire, they’re most likely not part of the Empire itself.
Like the BoM, I believe they’re a group of Galra that branched out from the Empire on their own. But unlike the BoM, they still seem to have ties with the Empire.
And here’s the thing. We know for sure that Lotor is part of it, or at the very least is disguising himself as part of this new Galra group (for reasons unknown at the moment). We don’t know for sure yet that Lotor is Galtean, but the possibility is so high we might as well consider him to be. We also know that Galteans are taller than humans, but shorter than Galra.
In the picture where this new group rescue/kidnaps Matt from the Empire, They appear to be taller, but not tall enough to be pure Galra. Weblum Galra, whether they’re Lotor or not, also appears to be similar to Keith in terms of size, rather than a normal Galra size.
If Lotor is indeed this group’s leader and he’s Galtean, it’s probably safe to assume all members of this Galra group are also Galtean.
This entire group might be whatever remained of the Altean’s civilization when it was still in speaking terms with the Galra civilization.