Japanese Type-Moon fan blog Seasons of Change recently posted a link to this page, which pretty much says the following:

"A new work from 竹箒 (Takebouki, or Bamboo Broom) called "Kara no Kyoukai - the Gaeden of sinners / recalled out summer" will be released during C74 (that's this summer's Comiket for you none-geeks). The item will be sold on August 16th at the East A-28 area."

Also, that big phrase on the top says:

"Hallucination of summer. Returning to the origin. A bonus track that connects the future and the past."

Sooooo, what does this all mean? While there are no concrete information, here is what we know:

1. Bamboo Broom is a play on Nasu and Takeuchi's names, and it's also the name of their dairy, so we can assume this will be a "doujin" group made up of the two that's not officially related to Type-Moon the company. In a way this makes sense since the Kara no Kyoukai novel was originally published as a doujin work, so they may want to do this doujin style as well.

2. The Type-Moon booth at this summer's Comiket will be in the industry area, but the address East A-28 is definitely not it, since the industry area is in the west hall, and it's possible that Nasu and Takeuchi will have someone else handle this booth.

3. Judging by the title, "Gospel of the Future" (未来福音), the new product could be a new Kara no Kyoukai doujin music CD. However, apparently the title is also that of an unwritten short chapter of Kara no Kyoukai, where Seo Shizune, a person with some kind of prescience ability, appears. So this could also be a new novel or visual novel. Although, considering Type-Moon has 3 new game in the work, the chance of this being a new visual novel is very low. But the "Gaeden" in the subtitle could mean "Gaiden", as in a gaiden to the original novel, as opposed to the misspelled version of "Garden".

4. Of course there has also been rumors of Type-Moon only attending C74 as a doujin group...

Also some fun little tidbits I found on Beast's Lair forum. It seems Type-Moon has registered trademarks for the following titles (with commentary from me):

• 真月譚月姫 (Shingetsutan Tsukihime) - For the anime/manga/franchise.
• 鉄の紋章 (Tetsu no Monsho / "Iron Emblem") - Possible new work?
• 歌月十夜 (Kagetsu Tohya) - The add-on game to Tsukihime.
• Ｆａｔｅ (Fate) - Likely for the entire Fate franchise.
• Ｆａｔｅｓｔａｙｎｉｇｈｔ (Fate/stay night) - The game.
• Ｆａｔｅｈｏｌｌｏｗａｔａｒａｘｉａ (Fate/hollow ataraxia) - Again, the game.
• ＧｉｒｌｓＷｏｒｋ (Girls Work) - one of the newly announced games.
• 月姫 (Tsukihime) - You should know this one by now.

Also, T-M has trademark application (not yet registered) for the following:

• 魔法使いの夜 (Mahoutsukai no Yoru) - One of the 3 newly announced games.
• 氷の花 (Koori no Hana / "Flower of Ice") - The "other" unpublished novel from Nasu, possible future game?
• 鋼の大地 (Hagane no Daichi / "Steel Earth") - From Notes. possible new work?
• 夜空庭園 (Yozora Teien / "Night Sky Garden") - No idea, new work?
• ＴＹＰＥーＭＯＯＮ＼タイプムーン (TYPE-MOON) - um...
• Ｗｉｚａｒｄ’ｓＥｙｅ＼ウィザーズアイ (Wizard's Eye) - Could be another new work.
• Ｆａｔｅ／Ｚｅｒｏ＼フェイトゼロ (Fate/Zero) - The novel.

In conclusion, Tsukihime 2 is light years away from seeing the light of day!