I will look into it.Extremely good Prestige Classes for your guys:
Sorcerers should take up Mage of the Arcane Order, it is fantastic for versatility. This will cost some feats, though.
Barbarians should become Bear Warriors for sheer awesomeness. Prerequisites are easy.
Shifter druid would have been nice, but as I never played a normal druid before, it's okay. I guess, as it's the DM's first time to run a campaign, he wanted our characters to be PHB standards. When we rolled the character, we did not even know the game was supposed to take place in Eberron. We only learned that at the beginning of the second session. For the other new players, it doesn't matter, either, as a half-orc or elf is as new to them as a shifter.I didn't see any Eberron specific races mentioned for the PCs. This is a real shame.
That's not how the Eberron variant works. Shifter druids don't get wildshape, but wild shifting, which is pretty powerful.Shifter is actually a horrible race for a druid as they get wildshape making the shifters abilities obsolete.