I am either blind or the Spellcraft skill description (and tables) do not have the rules for casting defensively (you know 15+ spell level).
The funny part is that the feat Combat Casting says:
"Benefit: You get a +4 bonus on Spellcraft checks made to
cast a spell or use a spell-like ability while casting on the
defensive or while grappled."
See the bolded part? What does that mean if Casting defensively does not exist anymore?
Casting defensively is still in. The info was mistakenly omitted from that section of Alpha.