I read about the possibility of a Sacchin route on a Japanese blog that posted scans of the latest TECH GIAN magazine (2008/06). It's a little bit up in the air at the moment but Nasu has teased us with the idea for so many years now that I bet he already has several scenes written up. Fingers crossed anyhow!
I was reading a bit of that Tsukihime remake at Tsukihime's game thread, but I wasn't too sure of it because there was not even a link to get myself informed. But I'll pray to get the Tsukihime remake and a Sacchin route