There's not a lot to report here, other than that he will miss some time. The hamate bone is fragile and is often broken simply during the course of a swing. The good news is that it was diagnosed right away and the surgery was done, rather than having Almore trying to play thorough the pain, as many players have done. Trying to play with a hamate injury zaps a players power, and Almora would almost certainly have struggled had he tried to play through the pain.
Long-term, this injury shouldn't have any effect on Almora's development. After hitting .321/.331/.464 between rookie and short-season ball after being drafted last year, Almora is scheduled to head to Low-A Kane County to being the 2013 season. That plan hasn't changed, but his arrival in full season ball should be delayed by a few weeks. Almora is still quite raw and is expected to spend the entire year at Kane County, so missing a few weeks shouldn't change his timetable in any way.