Hmm, also a singer by training, and I haven't noticed any pitch or range changes for me.
Your vocal pitch is caused by the length/thickness of your vocal chords, and I've always assumed that was basically unchangeable after hormones kick in at puberty. You can learn to use your vocal chords in a different way, but nothing physically has changed.
This is kind of fascinating to me and I wish I could get an opinion from an ENT with experience working with vocalists. In the meantime, I like Oboegal's answer.
katkitten - My air support and breath control are MUCH better now. Not to mention my self-confidence. Makes me wish, more than anything, that I lost the weight in college. Studio and recitals would have been such all-around better experiences.