We plan to release the Mac Universal Binary version 1.9.0 beta at some point this week. It may not coincide exactly with the main grid upgrade to 1.9.0 as the code exists in two different places, and merging the changes together then testing the resulting UB is not trivial. However, it is our goal to get this out to the Second Life Mac community with reasonable expediency!
Watch this forum for more information about the 1.9.0 beta!