@Mr Papa – Whether it is different from your panel depends on how you implement it. Your panel suggestion is more powerful. I think you could do something as simple as check for the # of themes or plugins a user has installed, compare that to the # now available, and put something in the updater that notifies the user of this:
“Hey, we notice you have 4 themes installed, but our theme repository has added 3 more. Check them out at {link}.”
Simple and effective.
As I said above, part of it is mindset. If SPF were as big as WP itself in terms of traffic to its theme/plugin repo, that check might be unnecessary. But it’s not. SP wants to encourage people to create themes & plugins. That’s a nice way to encourage developers to build your repo, because you promote people coming back and checking out new additions on every install. The updater was the biggest thing that made me take a new look at SPF. Without it, even though it was more powerful than other forum solutions, I wouldn’t recommend SPF, especially to less sophisticated users, because updates were just too much trouble. It’s just my personal opinion, but I think without my small tweak, you’re missing out on one of the biggest selling features of the updater, and without it, there’s less incentive for developers to add to your repo and for users to come back and check it out.