The FC live games - TSW, AoC, and AO - are maintained by an integrated live team. The team is small to start with, and the limited resources available are focused on TSW (for evident reasons, as otherwise the B2P model wouldn't make them any money). So don't expect wonders in terms of new content, even in the item shop.
The most significant addition to the item shop in recent times has been the Shadows of Vanaheim "adventure pack". If you have been reading the forums at all, you might have seen that its reception here has been somewhat "controversial". If you're interested, a number of players have written fair & balanced
reviews of the new content pack.
In my view, the main reasons to come back to this game are atmosphere (graphic design, music, lore & setting), combat system, and any friends you may still have in the game. By contrast, I wouldn't resub in the hope of game-changing new content or systems updates.