Well, it looks like third time's the charm! After the early release leaks we got about the current Taiko arcade generation and its subsequent upgrade kit, another massive software upgrade is in the works and ready to be booked for the arcades, simply known as 'Taiko no Tatsujin March 2013 version' (click here for more details). What's new this time?
-) The release date for the 2nd giant update is set for a generic March 2013, consisting this time only of a software update rather than introducing new hardware devices (like Katsu-Don's camera). Be aware that the '20 December 2012' reported in the page is the cutoff date for pre-orders of the software.
-) Just getting the software upgrade obviously costs less than the entire cabinet, priced at 50,000 Yen, lower than buying a brand new Taiko 0 arcade with the Katsu-Don software (998,000 Yen for the arcade base, and 278,000 Yen for the K-D kit)
Credits to crystalsuicune for the find!