Yup, lets be honest, can the players kick the ball along the ground and it stays down, yes, then the ball doesn't magically fly upwards if you touch it. Its still about how you kick it, a lighter ball might be harder to make dip but I don't really buy that either.
Remember that every year, every competition theres a new ball, and remember that EVERY time its lighter and keepers complain it moves more, dips more, curves more, etc, etc.
Yet England are complaining it doesn't stay down apparently, do people not remember that gravity won't work differently on a light or heavy ball, drop any ball from any height, they'll come down at the same speed.
Anyway, the actual situation is that England couldn't use the all in the EPL, because its under contract with whoever they are under contract with, every player in the EPL and La Liga hasn't practiced with it for 6 months, yet Messi, Tevez, Higuan are doing fine with it. Belhadj overhit the new ball just as much as he does in the EPL, SWP, Lennon, Heskey and Johnsons crossing is just as over and behind the goal as usual.
Lots of countries have used the ball in friendlies since Feb though, England didn't use it in friendlies either as they are under contract with Umbro, and apparently Umbro/England thought the sponsorship cash was more important than practising with the ball they would be playing with. THey only played in competition with the new ball in the final friendly before the world cup.
But they've been training with it for months, I would imagine behind closed doors they've been using the ball in training since a long time ago and anything else is a complete excuse, it doesn't take long to adjust to a new ball, you hit it a little less hard, or harder, which is already a skill players have, well some do. With any ball you get used to kicking it between a couple yards and 50 yards, its an incredibly minor adjustment and England/Fa are just trying to come up with an excuse for the waste of cash that is Capello.
Most cups/EPL seasons, and other leagues get a new version of a ball every year, they adjust, it takes no time at all, its sorted before the first game, people make excuses and it always turns out to be complete rubbish.