This fall, Monorail Peach will debut at WDW. The color will likely be close to Monorail Coral, which has deltas (white cutout sections), so expect the Peach stripe to be solid. Peach will bring the fleet's size back up to 12, which will hopefully help with the recent maintenance issues.
The story was run in a blog entry on the official Disney parks blog briefly on the morning of 8/12, but then pulled. Presumably, this was supposed to be a surprise announcement at D23.