Omnitrans recently posted up the details of their new OmniGO community shuttle service, which will begin serving Yucaipa, Chino and Grand Terrace on 7 September. Most notably, the route 325 will cover what used to be the route of the RTA 25 through Grand Terrace between Iowa/I-215 and the Loma Linda VA Hospital. (This portion of the route will be discontinued in RTA's own service changes next month, in order to cut costs.)
The OmniGo service will have fixed-route fares, is numbered to correspond to the major fixed-route connection that the shuttles serve (365 serving the 65 in Chino, 325 serving the former RTA 25, and 308/309 serving routes 8 and 9 in Yucaipa), and it appears to be timed to make connections to said routes- the 325 is listed with a 70 minute frequency, which happens to be the frequency of the current route 25. (I don't have official confirmation on this, but it stands to reason that it is the case.)
More details at Omni's site.