So SAP, Salesforce and BigQuery are on the roadmap. The connectors already exists, we just need to build the dialogs in the Sense client. You can leverage the QlikView connectors for Sense also however you currently don't get the same scripting support.
For Hadoop we have several options, ODBC for Hive, Impala, JethroData etc etc
It usually depends on which existing infrastructure you have around your Hadoop cluster.
Splunk has a ODBC driver so yes we support that also.
Google Analytics is a little bit trickier, QV Source as mentioned in the thread already has a good connector for it and there are some open source alternatives. I would however recommend QV Source as their data model will give you a HUGE boost in productivity as GA's metrics can be very hard to decipher.
Now we are looking into bundling drivers for specific systems BUT that is already freely available drivers.
If you look at some of our competitors, it's a very smart marketing move to bundle free ODBC drivers as it makes them appear to have lots and lots of connectivity options but in reality it's good ol' standard ODBC