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We do not have any release date planned. But the first Preview might not be too far away. You may follow the Blog's RSS feed or @smartgithg on Twitter to get informed as soon as it is available.
Version 22.1 will support diff.<type>.textconv.
For 22.1, the Changes View will support diff.<type>.textconv.
One problem I see here will be the disruption when switching e.g. from the compact Diff to the (necessarily) full Blame.
In the Preferences, Low-Level Properties you can disable rebase.disableRebaseMerges.
This behavior is expected.
Are you referring to the Log Graph's Follow Only First Parent option? If so, I can't reproduce this problem. Please send some small test repository for which the problem is reproducible to smartgit@syntevo.com.
Present for 22.1 for the new, built-in Git-Implementation (has to be enabled in the Preferences, Low-Level Properties, "experimental.gitimpl".
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This option will be present in upcoming version 22.1 Preview.