My suggestion is to not implement the rules if you don't want to. Fall back on rule 0, the DM has final say. That doesn't mean you have to be draconian about it, unless you're Dragon :D, but you have the right to not want to switch rules in mid game. My group and I have decided to forego using the new rules until the next game, even though many of us ARE looking forward to it. Mainly because it may very well affect game continuity and allow things that are contrary to things that couldn't happen before, and nothing is worse for a player than feeling jipped. So we'll just wait. It is very disruptive otherwise.
Then again I've never been a fan of the because TSR/WOTC says so thing. It is your game. Like the whole Lolth withholding her spells for her priests storyline, that you won't find out the reason for until the book let's you know in 2006 or something stupid. WRONG! Not waiting. Don't want to. One idea thrown out, because it doesn't fit the game.