A: Yes, as long as they download the equivalent iOS update (1.21.23). Bedrock cross-play works across all platforms.

While 1.21.23 is fresh, the community is already looking ahead. Data miners have found strings within the APK referencing generation overhaul and a new "Pale Garden" biome (a spinoff of the old Dark Forest). These are likely for 1.22.

As 1.21.23 is a sub-version of the broader 1.21 update, it includes all the major features introduced in the Tricky Trials Trial Chambers

Only if you get it from the official Google Play Store.