That is why nowadays I only buy technical books in digital format, unless they are only available in dead tree format.
The technology to save trees is here, so no need to keep killing them for new versions.
I don't think there is going to be a redbook for 4.4, seeing as the last edition (for 4.3) was published last April...
Why miss the chance to milk developers for another $59.99?
That one probably took a lot longer as it was a complete rewrite to deal with the core profile. 4.3->4.4 would only have to add the 4.4 stuff in.
4.4 doesn't seem to be a major change. Only adding some buffer stuff, DX10 compatibility and mega-texturing.
They probably wont put out another edition just for 4.4. They didn't for 3.3 and after all the complaints the 7th edition received, I doubt they'll put out another insignificant update.