When is the mainnet again?
Acording to @Tytanowy Janusz, we are on the mainnet already.
When ETH 2.0? Under development ... like everything in crypto... Dunno about sharding ETA but you can find the latest updates here:
https://t.me/IdenaGithub - telegram notifier about every GitHub update.
After recent mainnet release (that Andrew decided not to announce - are you scared of hype?) GitHub is on fire. Update few times daily.