I just found the following note the game's facebook page, it was published on December 11:
Details on the preorder:
- Preorder site will go live in the morning
- The game will cost $15 at launch, but will be available for a pre-order discount of 10%. So pre-orders will cost $13.50
- Pre-order 4-packs will be available for $45
- The pre-order is for the PC/Mac version only, not XBLA. If you are looking forward to the XBLA version, save your money!
- The PC and XBLA versions will launch at the same time
- The Mac version will likely not be available at the same time as the PC version, but will probably come shortly thereafter, however Mac beta testers have been running the game successfully in bootcamp, etc
- The pre-order will be sold through the Humble Store, and will come with Steam keys
- The Pre-order will NOT include beta access
- The Pre-order WILL include a bunch of goodies, to be announced soon
The game is already available for pre-order on the official website, but that bullet point made me want to wait for the next Humble Bundle. However, if you want to buy the four-pack - which gives you four digital copies of the game for the price of three - the official website seems to be the only place where you can do that right now.
I've also looked around and found no information regarding a release date for this forthcoming bundle. Actually I haven't found any mention of its existence outside of that facebook note, not even in the official twitter account (though they did retweet Monaco's pre-order announcement). By the way, since that bundle will include at least one awesome-looking game that hasn't even been released yet, I guess I'll get moderately excited for it.
This is pretty awesome news. Monaco looks fucking great. I'm stoked to play this game. STOKED I TELL YOU!