The Energon Pub

I´m sure that if Scorponok apears in transformers 2, dies when the movie is begining.

There are two fictions on what Scorponoks Alt mode is.
one is that his Scorpian mode IS his alt mode and he just prefers it over his Robot mode.
The other is that he Transforms into Blackouts engine.

I thought it was already established that Scorp has an animal-based robot mode and transforms into part of Blackout. That's what we see him doing in the film itself. Of course, he could be a triple changer with a robot mode, but it'd better not look like his deluxe toy.

There's one more positive to them coming back as is.

As it was mentioned earlier, they might update the figures with new sculpts, etc.

Well...they're going to need to fill the line up with old molds, etc.
What if they finally give us the Voyager (or bigger) Bonecrusher that we've been clamoring for? I couldn't think of a better filler figure.