I don't, but keeping an eye out here is probably the best way to find out; I'm pretty sure that's how I saw the announcement above.

Lots of publishers are making their textbooks temporarily available through resources like VitalSource and Redshelf, but (a) VitalSource at least is still reading DRMd material through a clumsy app (I haven't tried Redshelf); and (b) they seem more geared towards college textbooks than to scholarly works.