RiotScruffy on Twitter mentioned that it only works with dashes, not with Blinks like Flash. So Lucian and Graves cannot enter, but Kassadin and Ezreal can. I wonder if the ability can also be used in reverse, to keep an enemy from escaping? Kalista is going to have a bad time kiting a poppy if she gets in range.
PBE was just updated, data is being gathered about the abilities as we speak (damage and ratios I mean).
also
Spoiler
EDIT: Voiceover, quite a bit more cheerful compared to the old one. Liking the refernece to the old joke at 2:31