The release of the new Rallye Green, LeMans Blue, Corvette Bronze and British Green colors occured in the first week of January, 1968. I have a few cars in the database with 01A dates and these colors. I also have a few 12E cars with the discontinued colors, so I'm going to assume the color change occured on Tuesday, January 2nd, 1968. (I believe the factories were closed on the 1st, but I could be wrong. John?) I'm also going to assume the D90/D91 stripe changes probably occured at this same time, but I have no proof of this. Unfortunately, there's just not enough ORIGINAL paint cars in the database to go on.
As for pre-dating the January 24th date in the AIM, I'm not sure. Again, John would have to answer this.