http://www.sportinglife.com/football/news/article/165/9519649/uefa-president-michel-platini-makes-white-card-and-sin-bin-proposal
Platini's proposals:
1. The creation of a white card which would be followed by a temporary expulsion - a rest - of 10 minutes on the bench.
2. Five substitutions allowed: two changes at half-time, keeping the possibility of three changes during the course of the game.
3. Abolishment of the current rules that mean a player denying an opponent a clear goalscoring opportunity by committing a foul in the penalty area is typically punished threefold - with a penalty, red card and suspension. Instead: penalty and yellow card if the foul is committed in the penalty area; sending-off and free-kick if the foul is committed outside the penalty area.
Actually not completely bad ideas from the old bastard. I do think no. 3 in particular is fairer than what we have now. No. 1 I'm not sure about, and no. 2 I'd replace with 3 outfield subs allowed + one during half time, and in addition 1 goalkeeping sub allowed (at any time).