If the A-380 is going to be doing a lot of airport movements, taxing etc.. Would not the best viewing be on the west side of the airport... By the A taxiways where runway 25R/L are? If so, their is Cutter park in El Segundo, right next to the airport on top of a hill that gives spectacular views of departing and taxing aircraft.
The location of Cutter park is Cutter's Park, East Imperial Ave/Sheldon St in El Segundo, I even did a mapquest
link.
I think it will be very busy over there on that day, every
airline netter will be there trying to get pictures.
That is why I would be keen to park in my usual lot by in-n-out and find someone brave enough to drive over there. By car pooling us.
I think this option is best as you'll not need to worry about traffic at the airport, nor holding up funds on a credit card.
The only other thing that I could think of would be if someone had a radio scanner. This would allow us to hear communications between the pilots and the tower. I see many air netters with them when I visit this spot to watch airport movements.
On a side note, I have never been in T4, is the TSA any good there, meaning if I have my boarding pass for a UA flight that day, will be doing a MR, do you think I can get through security? I know their is a walkway that you can take to go from T6 to T5 is it the same with T4? Funny I should be asking this question, but I am never on that side of the airport. Even when driving through the airport I bypass that side for T6/7.