Brian: As Quentin notes, you can find the Changelog in the Manual itself. We're actually working on a site update that will likely have release notes available on the main page.

As for stereo editing, we'll see what happens. We certainly know people want to avoid Audacity and other editors. The trick is adding functionality while retaining simplicity. When people say Fission is so simple and it's perfect, but it just needs to do one tiny little thing more, they generally fail to realize that their "one tiny little thing more" is different from everyone else's. If we added every tiny little thing, Fission wouldn't be simple at all 8).

John Murphy: You can actually do this with just a couple quick keypresses:

I Home O for "From Playhead to Beginning"

I End O for "From Playhead to End"

I starts a selection at the playhead, then Home or End jump the playhead, the O extends to the select to the playhead.

Hope that works well for you!