On Naïve's website you can "preview" a forthcoming release including nine previously unrecorded arias.
"The Händel arias and orchestral pieces on this disc span a narrow
spectrum from the comparatively unfamiliar to the practically unknown.
Nine of the twelve arias are recorded here for the first time, as is the
D major March, HWV 416. The arias are mostly arie aggiunte, composed
for insertion in later performances of existing operas to accommodate a
different cast of singers. Some of these arias have come to light only
recently or have previously been inadequately identified. The
interspersed instrumental works were produced for purposes still
uncertain. Yet despite the sometimes shadowy origins of this music it is
all vintage Händel, and arias such as ‘La crudele lontananza’, ‘Sa
perché pena il cor’ and ‘Farò così più bella’ rank among the composer’s
most eloquent dramatic utterances".