First off:
Optimus Prime in Galaxy Force, doesn't feel like a gundam when you look at him.
He looks like a friggin tank that is ready to take on the world if he has too.
In all honesty when I first saw the first designs for this Prime I thought he looked like Mazinger*Physalis made this point too lol* I think is the japanese robot that Agent2man is refering to because of the enormous wings on his back.
But those are WINGS...Prime's "wings" are the trailer skirts with the wheels...
AND the hip cannons from the Freedom gundam? Are not a new thing...
the F91 gundam*noticed Dreamer making this very point*(and with respect to the line of Gundam...these bots have been around as long as the Transformers you should look up the huge following to the series

) which predates SEED had hip cannons, but in all honesty who cares?
So ideas are borrowed from other shows, and incorporated...look at the original Jet Fire.
He pretty much was a Macross innovation cross-over...at least in the toys, in the show he was his own bot...but the transformation is nearly the same.
All I can say is this new Prime has the regal appearance of a leader
and the look of "Hey Megatron I like peace, but that doesn't mean I won't wipe the floor with your rear and smack you around like a sissy-bot" all rolled up into one.