I believe that all the languages humans have created will be unified into a single language called Basic, Common, or another similar name. Other languages will still be used by some races or religions, but the Unified Language will be used for commerce, politics, and everyday speaking.
I believe that the alphabet of the Unified Language will be phonetic and will be more specific than the English alphabet, because it will have specific letters for long and short vowel sounds, as well as the schwa (uh) sound. I also believe that sounds like ch, sh, and th will be assigned letters.
Phonetics and roots/bases
The words of the Unified Language will probably have roots and bases in other languages and will probably contain a large amount of English and Far Eastern sounding words.