The only new thing I can see on the Millennium V1.1 rta is the optional Nano kit (separate purchase), which I have been told is not compatible with the V1 rta, but I wasn't given an explanation why.

Coppervape Millennium V1.1 Style 316SS 22mm RTA 4ml

Capacity: 4ml
Size: 22mm*44mm (without drip tip)
Weight 86g

Material: 316 ss, Glass
Thread: 510
Fireplace exchangeable: 12, 13 and 14mm
3 different bells interchangeable (pre-installed one)
6 adjustable airflow holes
3 different sizes of the positive post with airflow (pre-installed one)
Filling system for liquid adjustable control

Package Included
1* Coppervape Millennium V1.1 Style 316SS 22mm RTA 4ml (1.2mm airflow deck)
2* Extra Bell
1* Spare Kit (o-rings, screws, tool accessory, airflow Deck 2x0.8mm, airflow deck 1.8mm)

Coppervape 316SS Millennium RTA V1.1 Nano Kit 3 Chimneys

2ml capacity
Weight 36g

316SS material;
3 different chimney;
1 nano glass tank 2ml

Package Included
3* Chimney
1* Nano Glass Tank