List updated as of Dec 20 2019 of who has pulled papers for various offices of interest in San Bernardino County and/or filed with the FPPC or FEC. The filing deadline for open seats is December 11, 2019; all others December 6. SBC Elections notes that the list will be finalized by approx. December 20. Riverside anticipates having its certified list December 26. Candidates marked with an asterisk* have been endorsed by the California Democratic Party. Candidates marked with a pound sign# have been endorsed by the San Bernardino County Young Democrats. Candidates in italics appear not to have qualified for the ballot, as far as I can tell.
Note that there are 6 slots per Assembly District for Democratic Central Committee; districts with 6 or fewer qualified candidates will have those candidates appointed rather than going to the ballot. The San Bernardino County list of offices not going to ballot is here.