The Official Minecraft 1.4.3 Prelease is available now read about it and download it at
They Plan To release the official update on wendsday if there are no major bugs or problems so if you don't get the Prelease you don't have to wait long
Minecraft pocket edition 0.5.0 is submitted reported minecraft pocket edition devoploper jbernhardsson you can follow him on twitter @jbernhardsson you can also view a change log here