Too Soon to see what happens....
Everyone is expecting 2015 to be all about TA2.
3D is dying and inflation isn't increasing as it has for the past 10 years.
I'd say TA2 has a good chance of opening less than TA(200M - 210M).
If it does open "big"(215M - 225M), it will be the most frontloaded movie ever.
It's not making 623M domestically.
WW should hit 1.5B+ again.
We have to take into consideration that it took Marvel Studios 6 films for The Avengers to hit 1.5B WW.
MoS made 660M WW(more than any solo Marvel Studio film except for IM3),
TDK and TDKR both made 1B+(in 2D).
The potential for for B/S is very high. But TA2 has the sequel advantage.