Must admit, it would be very interesting to see the 'early' version - I personally suspect they found a last minute security issue that could have led somewhere re homebrew!.
Either that or a bug similar to the one in one of the earlier firmwares (#? 2.4??) that caused problems. (I can't remember the full details now, but think it caused partial bricks or something - maybe just a need to manually re-applying it, can't remember now!)
Still - pulling it at the last minute kinda suggests either a major security issue, or potential for costing them lots of $$$ !
Damn them! (Seems $ony devs are getting better! maybe they've been recruiting from the scene!!! hahaha!)