I'm always for seeing the D&D gods expanded. I don't really have any feelings about stats or not, but I think, as Erik said, its much more likely to get Complete Divine-style entries published.
The first notation I think we can make is that all of the remaining gods are going to be either Lesser deities or Demigods, since Hruggek is the "most powerful" and he's an Intermediate deity (so sayeth Complete Divine). The second is that the three we'd make up would probably also be CE, just like the rest.
As an aside, I think we'd be more likely to get this published if it was slightly more general about bugbears, as an article about bugbear gods seems like its going to strike a lot of people as superfluous (I'd love it, but a lot of people would wonder what impact it'd really have on their game).