This is confusing. The dev say "Last PoW block is 840960". What does this mean? Will it be PoS after that block? Or is it just the last PoW block with mining rewards?
To clarify out any misunderstanding, the PoW ends at the block 840960. It means at this point it's the last block with a "mining reward". What happens after that, I'm sure it will be one of the modern techniques nowadays that will be applied to the mechanics of the core to keep the blockchain running. I'ts very hard to tell exactly at this point what happens when getting more near the last blocks.
Happy mining till that!