One thing people are going to want for the Osmo is an ND filter or three 🙂 Luckily, since the DJI Osmo shares the same camera body as the Inspire 1 X3 ( with minor hardware changes ), the current crop of ND filters work with it.
DJI have their own set of ND filters for the Inspire that you can purchase here, ND8 or ND16 – http://store.dji.com/product/inspire-nd8-filter
Also available are ones from Polar Pro – https://www.polarprofilters.com/shop/DJI-Inspire-1-Filter
TacoRC ones are also very good – http://taco-rc.com/inspire-1-accessories/
No doubt there will be others available ( and some will even try and up the price as the Osmo is very new ). But in my opinion, its either the DJI ones that are very similar to the Taco’s or polar Pro.