Recently there have been ads in the El Dorado paper by two different oil companies that appear to be an attempt to locate unleased mineral owners.  Too early to know if these areas will proceed to well permits or if they are actually brown dense areas of interest, however these areas were involved in some of the early brown dense leasing.  The areas are:

Atlanta Oil  S10 & 11  T19S R15W

Weiser-Brown S23 T18S R17W