User blog comment:Krufix/Pink ward mechanics rework/@comment-121.54.48.5-20120415093218/@comment-4636093-20120415111316

"'detect' stealth units if they are already in 100 range of them by seeing them as "blurred". at least this would give players enough time to react to the gank or scout and making stealth users be more cautious into scouting and ganking."

That's sort of what's going to happen with the stealth rework proposed. Twitch and Eve are getting perminantly stealthed however if they get too close to an enemy champion they're revealed. Other stealth currently in the game (Teemo, Wukong etc) will still gain full invisibility though.