I hate to say it but I feel like people outside of the Ethereum space have no idea that what's launching in 2020 is not the full Eth2 suite.

So here's a PSA:

What's launching this year is Phase 0 of Eth2 which is Proof of Stake only - no sharding, no smart contracts, no txs.

Phase 0 (aka the Beacon Chain) acts as the foundation for later phases.

Phase 1 will bring with it sharding (the "shard-chains").

Phase 1.5 will be the eth1 <> eth2 merger (eth1 becomes a shard of eth2).

There is a 'Phase 2' that will bring with it state execution, smart contracts & cross-shard transactions but there is also another path that the community may pursue.

This path is outlined in the below post from Vitalik.

https://ethereum-magicians.org/t/a-rollup-centric-ethereum-roadmap/4698