Heh, it's not exactly new, and I'll believe it's been published when I have it in my hands. That book had already been in development for years—and was due out any day now—back when I used it in Physics 136 (Blandford himself taught one of the terms). That was 1997.

The material is great, though, including the coverage of tensors, which served me well the next year in General Relativity (Thorne's last time teaching it). If you're looking for a solid intro to tensor algebra & analysis, I definitely recommend it.