According to Roch Kubatko, the Orioles showed interest in Neil Walker a few weeks ago, which became much more serious during the GM meetings.
"I heard a few weeks ago that the Orioles had some interest in Pirates infielder Neil Walker and were checking whether he might be non-tendered. As it turns out, they took it a step further and engaged in trade talks during the general managers meetings in Boca Raton, [Florida]."
Kubatko goes on to note that the talks stalled as the Pirates were "seeking more than the Orioles were willing to surrender" especially considering that Walker is set to make "around $10 million" next season.
Despite talks breaking off, the "Orioles and Pirates could resume talks at the Winter Meetings that begin Dec.7 in Nashville. It's assumed that Pittsburgh is seeking young starting pitching, which the Orioles already surrendered last winter in Stephen Tarpley and Steven Brault to acquire outfielder Travis Snider."
If the Pirates are indeed looking for a starting pitcher, the Orioles have the pieces to acquire Walker, but they might be reluctant to part with a controllable asset for an infielder who will become a free agent after 2016.
Baltimore would also have to get creative as to where Walker would play, as he's only been ever played second and third base in the major leagues, where Jonathan Schoop and Manny Machado are respectively entrenched.
According to Kubatko "some scouts believe he could transition to first" where he would replace Chris Davis, who will likely be playing for another team for 2016 and beyond.
As of now, it would seem that the Orioles interest in Walker is legitimate, but unless the asking price comes down, a deal isn't imminent or likely.