Don't know build dates, just product info. It's likely that they will start build next week, because the factory has been closed for 3 weeks. The changes are minimal.
Literally 2 new colours, high gloss rear bumper fascia on all sports models, paddle shift for redlines, black roof option for redline sedan from early 2015, alloy spare wheel on all sedans and wagons above evoke (utes will have no spare at all if I read it correctly), new lines on the reversing camera,no more DVD with satnav option, the caprice model is finished(only a V series now with an LPG option), no more LPG SV6, black trim is now standard on all models(big news on redline), new power steering upgrade to improve on centre feel.
I'm might have forgotten some other little bits, but that's most of it.