This is Etude number 13 in c-sharp minor / D-flat Major. Yes, it really does change keys halfway through and never return. This one tests expression and flexibility. In addition to changing key halfway through, it also changes to a slightly faster tempo. It's an interesting one.
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About the etude project:

I've been challenging myself to practice a different etude every day and prepare it to the best of my ability in one day. This has been very helpful, but I wanted to add an additional element of pressure/nervousness. So I started recording them to post here.

It's not a real performance- I usually AM playing with a metronome, and I usually record these in a couple of takes and put them together later. I'll try to do them in a single take when possible, but usually I'll break them up.
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Recorded on 8/2/2013.