I've updated the Cat gearing guide, which now includes pretty much every item from ToC and Onyxia pieces. Go check it out here.
Not a lot to report in terms of changes, honestly. The Onyxia loot isn't that stellar for cats, and you shouldn't be super thrilled to get it.
On a side note, my personal DPS has gone way down compared to others recently. Part of that is the reprioritization of gear that I've done for bear; most of my good pieces have been converted to bear pieces and regemmed appropriately. Part of it is that I'm rusty. But a big part is the hit armor pen took. I'm still doing okay, mind you - but I'd definitely consider not stacking armor pen as the big win unless you have some odd non-ToC pieces around to do so.