Pluggable Hadoop lists some extensions to Hadoop in the pipeline: job scheduling (including one based on Linux's completely fair scheduler), block placement, instrumentation, serialization, component lifecycle, and code cleanup (the analysis used Structure101).
I found the reason why HQL was removed from HBase (to be replaced by a Ruby DSL and to ensure that HBase wasn't confused with an SQL database) and moved to HRdfStore.
There's also rumours that Microsoft's recent investment in Apache may lead to them working on Hadoop too.
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