For mk2 there will be prototypes first obviously, whole new design with canards, different from mk1/1a stage. I think by rollout they meant prototype rollout. At least that is what Dr Kamat sir said during defexpo22
below are the parts where they talked about lca mk1a & a bit mk2, last call they mostly talked about su30 engines, a bit on amca , the heli side, bit on uav side etc. very little on actual mk2 really.
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Like everyone I am also waiting on what their current plan is, but that part about work share with ADA etc, these processes can cause a bit delay. Actual work definitely have started since program got funding cleared. So fingers croossed timeline could be met. My take is that they have concrete orders of 83 mk1a, and Mk2 is a proto rollout case. So precedence will be given to fulfilling those Mk1a orders first, because those production lines will then be diverted to Mk2 once the 83 orders are cleared. That order clears by 2028 or so by contractual agreement. So this timeline 2024-2028 gives HAL enough time to prepare Mk2 into production ready. I am not sure they will be opening a separate production line dedicated to Mk2 before 2028.