They're not having a hearing on SB 562 specifically, but a more general hearing on getting to universal health care, including single payer options or filling in the gaps in the current system. Here's Lara's response: http://sd33.senate.ca.gov/news/2017-08-24-statement-senator-ricardo-lara-assembly-speakers-creation-select-committee-universal (He's the original author of SB 562.)

Assemblymember Wood's statement is also worth looking at to see where some of the issues may be https://a02.asmdc.org/news/close-home-path-universal-health-care

Assemblymember Arambula didn't issue a statement, though he has spoken positively of single payer in the past.

At least they are all talking to each other . . .