We explored a new objective that was targeted at burst champs like assassins. Found some interesting concepts that we'll probably explore again at some point, didn't hit on anything we felt was ready to be shipped though. Part of the reason for that is that there are a lot of objectives on the map already at this point, so the bar for adding another one has to be pretty high.
We'll probably change kits so that some abilities do reveal invisible champs (unreliable ones, or those with long CD) and some only give red trinket style reveal (can see the silhouette, still can't target). We're fine with some champs being better choices than others against invisibility users, don't want to make them too strong a counter though.
No current plans for changes to regular wards (SightStone/yellow trinket/Trackers) or blue trinket wards.
Machete/Talisman still build into the jungle items (PVP smites still exist).