The current version I am running is V1.55, and those who have been joining coops over the past few weeks are also at that level, including Osku, Variable, Tony, Bubba, rundll.exe, Zwobot and Grip.
As the release of the PMC DLC is this week, there will probably be a patch released as well. The features for BAF 1.02 were announced on the BIS forums, so I expect a combined Arma II/Arrowhead/DLC lite patch. Therefore version 1.55 is to be superseded very soon anyway.