I'm starting to doubt the 20th as the release date, as much as that depresses me. I wonder if there was a mistranslation somewhere along the line, since that date hasn't appeared in anything official in English, at least not so far that I know of.
Printable View
Calling it right now, they're Bind-On-Drop, and there is a 50% chance for them to drop in place of gear items from Boss chests. Along with the 25% chance for last-tier crafting mats. And 15% chance that an accessory will drop.
Unless, of course, you're actually actually interested in playing Triple Triad, in which case Murphy's Law will ensure that these percentages for you specifically are switched around so there's only a 10% chance of getting the card. 1% if you want the Foil version, .1% if you want the HQ Foil.
Watch some of the better cards be desynthable into new/rare mats, sort of like refining cards in VIII.
Silence usually means they are cramming to make sure it gets released by the 20th. If they were going to delay it now they most likely would of said something earlier and if they do end up delaying the patch it will most likely be from an unexpected issue that arose as the week progresses.
IIRC patch 2.4's date was announced by Yoship during a live stream as well before it even came out in lodestone news.
During the nico nico 2015 countdown, Yoship himself announced the date: http://www.famitsu.com/news/201412/31068955.html
I think SE are rushing to finish the preparation works for the patch but maybe they might have some issues.
There's this news on the JP lodestone not found in the English version:
http://jp.finalfantasyxiv.com/lodest...165.1379583591
It states the possible dates and time range of the maintenance and advise users who wants to book the Eternal Bond ceremony to avoid those dates.
A quick Google translate of this Famitsu article pins the 2.5 drop on January 20th.