You're right, I don't see the updates on https://developer.bigfix.com yet. Here's some initial info.
For inspecting locked files, we have introduced 4 new inspectors to access data within the locked file: locked line, locked content, locked section, and locked key. So you would use something like
exists locked line whose (it as string starts with "Error") of file "C:\path\inusefile.log"
For command timeout, you will use the override option on the wait command with new keywords "timeout_seconds" set to the number of seconds until the command times out, and "disposition" set to either abandon or terminate. For example, to have a command timeout after 10 mins and allow the process to continue running in the background, use this actionscript:
wait installpkg.exe /q
Once the updates are published (probably in the next day or so), additional details will be available here: