Adaptive Chassis Control was optional on certain mk6 Golf models, including the GTI.
Although the mk6 had various build year updates and changes during it's model life, I don't think there was an actual facelift mid-way through the mk6 lifecycle. Although the mk6 Golf was marketed as a new model, it was actually a heavily face lifted version of the mk5 Golf.
As far as DRL's are concerned, all mk6 Golfs had DRL's from the start of mk6 production. GTI's and GTD's equipped with the optional xenon headlights used the dipped beam headlight as DRL's at the start of mk6 production, but the design of the xenon units was later changed (I think for 2011 model year) to incorporate LED DRL's. The 35 year GTI anniversary model had xenon headlamps incorporating LED DRL's as standard.
The GTI/GTD models also gained rear LED light clusters for the 2011 model year (from around build week 22 in 2010).