better hybrid experiance
Search integration should be seamless between O365 and local installation. A method for combining navigation would also be a plus. With search integration I'd like to see a better hybrid discovery story similar to what we get with exchange. Even better if I can add a 2016 server and great a hybrid endpoint without uplifting 2010/2013 farms even a bigger plus.
Hopefully the O365 / SharePoint cloud search service application meets with your approval for this level of integration