I don't really use my microsd slot. I usually listen to music with headphones and so I don't need high quality speakers. For the screen size, i would prefer if it was bigger than what it is now, atleast 5.5inch.
One thing I cant stand about my current phone is htc's skin, sense ui is super annoying sometimes, I also don't like that it dosen't have a fingerprint scanner or nfc, although the latter isn't too improtant