From ANN:

The main character of the story is Haru Irei, a boy who becomes a "Gunpla Builder" after a fateful encounter with the Beginning Gundam plastic model. (In real life, Bandai is producing a Beginning Gundam model kit in 1/144 scale, but has not set a release date or price.) Rina Noyama is an always cheerful girl who, like her friend Haru, is a big fan of Gunpla. Haru's pal Kenta Sakazaki is a boy who loves Gunpla and gives advice to Haru about building them.
We all know that Gundam shows are 30-minute Gunpla commercials (admit it, it's true). At least it's more obvious this time.

Despite being a GunPla show, there will still be MS battles through Arcade Simulators by using the model kit as the "data cartidge"(Isn't that awesome?).

The series will be in OVA format.

Official Website