There is a nice little pic of a status 'glass' used by the Klingons (you wont see it for long, Worf is about to crash through it). The things is red are hard to see, but the things in white aren't, and it's the things in white that I noticed.
Upper left, 3 Birds-of-Prey, and a K'T'inga Left, 2 Negh'Vars (so they made them into a class now, eh?) Bottom Center, another Negh'Var (wow, even more!) Right, 2 Birds-of-Prey
Now, my guess would be that these might actually be fleets instead of single ships, but the number of Negh'Vars in here is suprising to me. My question is, why haven't we seen them?
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I can make out one more Ktinga in red...uh, on Worf's shoulder. I guess the in-show reason why we haven't seen much of the Neghvar, is because it's a command ship, and it's big and slow. It would have to be accompanied by other ships if it were to go anywhere, since it's big and is a sitting duck if a bunch of small ships attacked it. Or something like that :P