I'm not involved in the playtest of 5Ed, but I have a wish: I hope 5Ed can make counter-spelling and the negation of magic (by casters and non-casters alike) effective and viable as a tactic, even to the point of being a PCs main shtick.
I've wanted this for a while, especially after playing M:tG, but have always been disappointed.
Is the any glimmer of decent anti-magic in 5Ed so far?
Maybe instead of a simple counterspell system (as others have said, it can lead to tedium), we should look at some kind of way for spells to interact and interfere with each other in interesting ways beyond just works/doesn't work. Say, a sleet storm spell makes aoe fire spells into short-duration fog clouds instead, or lightning effect + water effect changes the area of the lightning effect.