It appears when asked about new supplements, the Black Library responded with possibly some great insight to what and when is on the horizon as far as print edition releases go. Check out the following sent in by a reader.
Please remember that even though the Black Library responded with this, it still must be considered a rumor.
via a reader on Faeit 212
Emailed black library to ask about supplements. Was told to expect some soon with print edition of sentinels due out march and iron hands clan due easter.