Hints about last bonus -
It is
RPG
PC + MAC

someone, not me, described the game as "Sci-fi Skyrim"

it's on Steam Greenlight and, as is typical here, you'll get a Steam key if greenlit
not that one
never bundled before

Could be this?

http://steamcommunity.com/sharedfiles/filedetails/?id=93077318

It was the last game added to their Greenlight Collection page. Seems to fit those hints.

The Steam Community is currently unavailable. Please try again later. :/

It works for me after I refresh a couple of times. The game is called Exoplanet: First Contact. Seems like it's still in alpha stage, so I don't know how likely it is to be the bonus.

Oh, and the next Groupees bundle will be Japanese themed. All of the games will be from Japanese developers.

3rd bonus unlocked
4th bonus @ 4500 Exoplanet: First Contact
5th bonus ???
Cherry Tree High Comedy Club would be great.

I noticed when I went to buy it that there's no charity option this time. That's disappointing.

And Recettear and Aselia the Eternal.

I'm betting War of the Human Tanks will be included.

4th bonus unlocked
5th @ 6000 - Vox Soundtrack

Cherry Tree will be in the bundle. Ether Vapor Remaster. Yatagarasu Attack on Cataclysm may also be in it?

http://gallery.mailchimp.com/bfebd948a16e44c6d947d9410/images/doujin_teaser4.jpg

Apparently it starts next week.

Sweet! :)
Sorry, no idea about the rest. :I

I edited my post with 2 other games right before you replied, lol.

Ether Vapor Remaster and Yatagarasu Attack on Cataclysm might also be in it.

Got the info from here:

http://www.reddit.com/r/GameDealsMeta/comments/1jmrsb/upcoming_groupees_doujin_bundle_wteaser_image/

wow, I just looked at these games, and if you're right this will be amazing...
A King of Fighters ripoff and an Einhander-like game? wow.

And last bonus unlocked. :p

6 hours left and 1 game only is on.

Thinking of jumping into Rune Classic, but mostly for Exoplanet.

Hmmm, Laxius Force just turned up on Desura. Wonder if we'll get keys?