Originally Posted by
Axelond
This was posted on front page a few days ago
Patch 5.4 - Timeless Isle
"Most NPCs, objects, and gathering nodes scattered around the isle drop Timeless Coins, as well as the pet battle and lore daily quests."
"Timeless Coins are used to purchase Timeless Caches for 7500 x Timeless Coin, which reward item level 496 gear, similar to Battlefield: Barrens. You can also buy Mogu Runes for 2500 x Timeless Coin."
So it looks like they are adding in another system to get the coins from, If the old lesser charm system is still in place is unknown and yet to be announced I think.