"Hopefully" is more impersonal than "I hope". It is a more general type of hope, rather than a personal feeling on the part of the speaker. It's more similar to "Let's hope..."
"Hopefully" is also more optimistic than "I hope". If he'd said "I hope it'll bring in some information", this could imply a level of doubt. "Hopefully" implies a greater degree of confidence.
It's not especially colloquial these days.
Many years ago, teachers used to disapprove of using "Hopefully" in this way (for reasons too flawed and tedious to mention), and told us to use the very formal "It is to be hoped that....". Thankfully - another adverb use they disapproved of - that doesn't happen any more.