The Sens' also signed D Luke Richardson to a one-year, two-way contract on Saturday, according to CBC. I thought Richardson looked alright during his tryout in training camp, although not tremendous. He is not the kind of defenceman Ottawa needs, though, and I don't think he'll actually be heading to Binghamton at any point this year.
Although I don't want to predict anything untoward, I think this signing might mean there's a move coming soon. The Sens, with Richardson, have eight NHL defencemen: Chris Phillips, Anton Volchenkov, Jason Smith, Filip Kuba, Alex Picard, Brian Lee, Christoph Schubert, and Richardson. It's unlikely either Lee or Richardson will be sent to Binghamton. Keep in mind that, as versatile as Schubert is, GM Bryan Murray told him he'd be getting a good chance at playing defence this season. I'd like to see him stay, but I didn't see enough from Schubert to believe he could crack the top-six on defence.
EDIT: The Sens' also sent surprise forward Zack Smith bown to Binghamton. Apparently it wasn't because Smith didn't make the cut, but because his development would require more ice time than he would be getting on the Senators' roster. He'll most certainly help the B-Sens out this season.