While at Strings 2014, Clifford Johnson particularly liked one of the "visions talk", the talk by Andy Strominger.
The amount of progress in the last 30 years really looks impressive with the hindsight.
Andy has also sent e-mails to all speakers at Strings 2014 and/or physicists who were sufficiently important for the conference. Their task was to send a short "interest question" that should be answered by the future research, and perhaps a hint.
He has received 74 contributions. Most of them are closely linked to some of the proponents' recent papers – so some of them are not so impartial advertisements of some of the technical and perhaps "not everlasting" research that was done. But if you look at the questions statistically, you will see that there are lots of questions that are really deep and interesting – yet accessible to doable research that actually has a high chance to nail the questions down.