The main change is the dynamic editor that will expose all the parameters you need to edit Maya objects Indigo-wise. That editor is called the Indigo Palette, you will use it a lot.
This GUI has been my main activity on MtI lastly, it's not perfect yet but quite operational already. However I have overlooked a bit the rest of the exporter, so after verification it appeared that it was better to prune some unstable functionalities rather than releasing an early but unstable beta. These will be restablished progressively.
so here we go with MayaToIndigo 1.1.03 (beta) !
Read the Quick Installation Guide first, then the Kick In Book

Again please read the two text files first then have fun, I'll add more educational material soon.
Of course your questions, remarks and requests are welcome, I will be glad to take them into account for an ehanced workflow !