My play-style doesn't require me to have the latest expansion(s), in fact I'm presently playing a level 8 monk on TLP, a level 52 necro on the other progression and occasionally logging an 85 monk on a regular server that I use to hunt information for this site. I hadn't bought an expac for the last 2 years and at no point pretend to know what is going on in the game's more recent content. However, I like to support the game so every 2-3 years I'll buy an expac. As an all-access member I even got a discount on the purchase which is nice.
I might get use out of the illusion ring feature as I have a character on the FV server with a ton of illusion items.
I'll admit that another TSS (newb to endgame with new race) style expac would have me immediately buying it, but that's a different matter.
How many of you are doing the preorder for The Broken Mirror?
What new content/features/revamps are you excited about?