Thanks for your query!
Showkase and Juicebox are, indeed, still actively being developed and supported (although it certainly has been a while since the last release of either product).
The next versions of both will likely be bugfix releases (rather than major new versions introducing new features) but, unfortunately, I really do not know when this might be and any estimate I give could turn out to be wholly inaccurate.
I'm sorry I cannot give you any more news at the moment (like what to expect in the next versions or when they will be released).
All I can do just now is reassure you that both products are still alive and kicking!