I'm eagerly awaiting its release.
BTW did you know that Crane labs has come out with a SPR II? (and it seems there is a transitional between the SPR and the SPR 2). I just found out about this week.
They changed the freefloat tube and the Front Sight (its now mounted on the tube instead of on the gas block).
If you interested let me know, and I can point you toward the info & pics.