When it ends the gates of the Lower Planes will be sundered! Fiends, demodands, daemons and the Abyssal Horde will spill across Faerun! A portal will open between Toril and Oerth and the Scarlet Brotherhood will start manipulating the electrum exchange rate! A 28/30/12 F/Ma/T Tarrask will be released!
If they include a new toolset that is easier to use than the one they released with the original, that will be worth it. Either way, I'm one of the suckers who will buy it. It's still infinitely better than Neverwinter Nights.
Start planning your party now.