Think this just depends on how long your willing to wait but from what i read about the LG handset you wont see a thing about it till CES apart from rumored specs and again all just speculation. if you like the Z Ultra go for that. There will always be the current handset beater around the corner just go with what you like at the time. you never know the speed Sony are going you might just see a Z Ultra 2 at CES.
Same site giving us details to the Xperia Z2 already damn.
Mobile History = Xperia Z Ultra (current), Xperia Z, Xperia X10 Nexus 3, Xperia S, N900,SE X10i, Nokia N95 8gb, SE W960i,SE k750i, Nokia 3650, Nokia 7600, Nokia 7650, Nokia N8, Nokia N97, Nokia N73, Nokia 6111, Nokia 6680, Nokia 6630, Nokia 7610, Nokia Ngage, Nokia 3210, Nokia 3310, SE W910, SE T68i, Sam D500, Sam D600, Iphone 4, BB 9800,
Ill add the rest as i go along.