I tried this new yellow REI marked trail this weekend. It needs to harden up but just like the white REI trail, it's twisty and fun. The white trail has firmed and is in A-1 condition.
The FBRP is currently re-routing trails in the middle portion of the Preserve near the two old reservoirs. These are some of the older trails that are heavily eroded. The re-routes will be a huge upgrade to this section. The area keeps getting better and better.