3.7.0a2 is out now.  There will be an .0a3, .0a4, then .0b1 in January.  Ned is saying that at least the last of these will be compiled to work with 8.6.  Once that occurs, I would switch as most of the remaining changes before the .0 release will be fixes to new features, which you can not use.  With respect to existing features, 3.7 should be as good as 3.6 as 3.7 has all of the bugfixes in 3.6 plus some that will only appear in the future 3.6.4 release.

Irv, when you reply by email, please delete the quoted previous message (except perhaps for a phrase being specifically addressed).