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When you export a Content by Query web part and open it up there is the <property name="QueryOverride" type="String" /> tag which allows you to put in your own CAML query to specify further filters and sort by's.
I know that you can, in this property as well, query the Content Types, but is it also possible to query for List Types if I want to query 4 different List Types in 1 CQWP?
I don't think specifying lists in CAML query in QueryOverride property is possible. The list is specified in Source property of CQWP.
You can add a CAML query into the QueryOverride, I've done it and it works flawlessly to help filter results more appropriately. You cannot however specify a list type to pull from, only list fields are available.
