Passing along some information from Samhain Senior Editor Angela James:
Samhain is open to submissions.
In the most recent issue of the RWA’s Pro newsletter (Prospects) it was reported that Samhain is closed to submissions. We’re unsure where the erroneous information came from, but we are not closed to submissions and have no plans to be. We continue to accept submissions in all genres of romance, as well as science fiction/fantasy/urban fantasy all with romantic elements. Submissions guidelines can be found http://samhainpublishing.com/submissions. All questions and submissions can be directed to email@example.com .
So there you go! The scoop, right from the source.