Back end of the year and no idea respectively.
With regards to CPE whatever will be cheapest I imagine. After the farce with the Puma 6-based Arris this will likely be an Arris-built Puma 7-based piece of kit. Should be able to secure some nice discounts in recompense for the embarrassment and grief it's caused Liberty Global.
They may go for quality but I'm not aware of either VM or Liberty having any kind of form for spending more on better CPE.