According to multiple sources (just check any major sports website), the Browns are set to make Dick Jauron their new Defensive Coordinator. There was some speculation that he'd remain in Philly and jump up to their DC after the Eagles fired McDermott, but it appears that his relationship with Mike Holmgren and Tom Heckert has swung his favor in the Browns'... uh... favor.
Per the PD: In an appearance on Pro Football Talk Live, [Paddy] Shurmur declined to confirm or deny Jauron's hiring. "I think it'lll become public and official from the Browns side very quickly," he said. "Obviously Dick's a very well respected guy in the profession, a guy I've known him a long, long time."
Sounds like "I can't confirm it, but, yes, it's true" to me.
Jauron - 60 - is an experienced defensive coach that was previously the Head Coach in Chicago and Buffalo (man, who hasn't been the HC of the Bills?). Speculation runs rampant that he will convert the team to a 4-3 set, which would mean considerable turnover at a lot of the Front 7 positions (although, a lot of those positions need turned over regardless of the alignment).
Experts (OK, just me) feel that this is a solid hire by the Browns, giving the Coaching staff an experienced, respected coach to go along with rookie Head Coach/Playcaller Paddy Shurmur, an important aspect at the inception of this regime until Shurmur can grow into his role.